diff --git a/src/aud/exam/prep/list/DoubleListItemProcessor.java b/src/aud/exam/prep/list/DoubleListItemProcessor.java
new file mode 100644
index 0000000..67829ce
--- /dev/null
+++ b/src/aud/exam/prep/list/DoubleListItemProcessor.java
@@ -0,0 +1,6 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.SequenceProcessor;
+
+abstract class DoubleListItemProcessor<T> implements SequenceProcessor<T, DoubleListItem<T>> {
+}
\ No newline at end of file
diff --git a/src/aud/exam/prep/list/IterativeDoubleListItemProcessor.java b/src/aud/exam/prep/list/IterativeDoubleListItemProcessor.java
new file mode 100644
index 0000000..a9a6393
--- /dev/null
+++ b/src/aud/exam/prep/list/IterativeDoubleListItemProcessor.java
@@ -0,0 +1,194 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.Pair;
+
+import java.util.Comparator;
+
+public class IterativeDoubleListItemProcessor<T> extends DoubleListItemProcessor<T> {
+
+    @Override
+    public boolean find(DoubleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean findBinary(DoubleListItem<T> list, T t, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean override(DoubleListItem<T> list, T from, T to) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean overrideAll(DoubleListItem<T> list, T from, T to) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean overrideAt(DoubleListItem<T> list, T to, int index) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void insertInOrder(DoubleListItem<T> list, T t, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean remove(DoubleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean removeAll(DoubleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isAscending(DoubleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public T max(DoubleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public T secondMax(DoubleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isItemWiseLessOrEqual(DoubleListItem<T> a, DoubleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isItemWiseLess(DoubleListItem<T> a, DoubleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isLexSmaller(DoubleListItem<T> a, DoubleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void exchangePairs(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void rotateTriples(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void removeEverySecond(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void doubleAllKeys(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> rotateRight(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> rotateLeft(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void removeDuplicates(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> invert(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> clone(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> alternate(DoubleListItem<T> a, DoubleListItem<T> b) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> merge(DoubleListItem<T> a, DoubleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<DoubleListItem<T>, DoubleListItem<T>> divideAlternating(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<DoubleListItem<T>, DoubleListItem<T>> divideAlternatingByRuns(DoubleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<DoubleListItem<T>, DoubleListItem<T>> divideByPivot(DoubleListItem<T> list, T pivot, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean check(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> create(Iterable<T> iterable) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Iterable<T> iterate(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+}
\ No newline at end of file
diff --git a/src/aud/exam/prep/list/IterativeSingleListItemProcessor.java b/src/aud/exam/prep/list/IterativeSingleListItemProcessor.java
new file mode 100644
index 0000000..2a8e9b4
--- /dev/null
+++ b/src/aud/exam/prep/list/IterativeSingleListItemProcessor.java
@@ -0,0 +1,194 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.Pair;
+
+import java.util.Comparator;
+
+public class IterativeSingleListItemProcessor<T> extends SingleListItemProcessor<T> {
+
+    @Override
+    public boolean find(SingleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean findBinary(SingleListItem<T> list, T t, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean override(SingleListItem<T> list, T from, T to) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean overrideAll(SingleListItem<T> list, T from, T to) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean overrideAt(SingleListItem<T> list, T to, int index) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void insertInOrder(SingleListItem<T> list, T t, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean remove(SingleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean removeAll(SingleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isAscending(SingleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public T max(SingleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public T secondMax(SingleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isItemWiseLessOrEqual(SingleListItem<T> a, SingleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isItemWiseLess(SingleListItem<T> a, SingleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isLexSmaller(SingleListItem<T> a, SingleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void exchangePairs(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void rotateTriples(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void removeEverySecond(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void doubleAllKeys(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> rotateRight(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> rotateLeft(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void removeDuplicates(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> invert(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> clone(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> alternate(SingleListItem<T> a, SingleListItem<T> b) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> merge(SingleListItem<T> a, SingleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<SingleListItem<T>, SingleListItem<T>> divideAlternating(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<SingleListItem<T>, SingleListItem<T>> divideAlternatingByRuns(SingleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<SingleListItem<T>, SingleListItem<T>> divideByPivot(SingleListItem<T> list, T pivot, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean check(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> create(Iterable<T> iterable) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Iterable<T> iterate(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+}
\ No newline at end of file
diff --git a/src/aud/exam/prep/list/RecursiveDoubleListItemProcessor.java b/src/aud/exam/prep/list/RecursiveDoubleListItemProcessor.java
new file mode 100644
index 0000000..5a0a317
--- /dev/null
+++ b/src/aud/exam/prep/list/RecursiveDoubleListItemProcessor.java
@@ -0,0 +1,194 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.Pair;
+
+import java.util.Comparator;
+
+public class RecursiveDoubleListItemProcessor<T> extends DoubleListItemProcessor<T> {
+
+    @Override
+    public boolean find(DoubleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean findBinary(DoubleListItem<T> list, T t, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean override(DoubleListItem<T> list, T from, T to) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean overrideAll(DoubleListItem<T> list, T from, T to) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean overrideAt(DoubleListItem<T> list, T to, int index) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void insertInOrder(DoubleListItem<T> list, T t, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean remove(DoubleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean removeAll(DoubleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isAscending(DoubleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public T max(DoubleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public T secondMax(DoubleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isItemWiseLessOrEqual(DoubleListItem<T> a, DoubleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isItemWiseLess(DoubleListItem<T> a, DoubleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isLexSmaller(DoubleListItem<T> a, DoubleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void exchangePairs(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void rotateTriples(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void removeEverySecond(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void doubleAllKeys(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> rotateRight(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> rotateLeft(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void removeDuplicates(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> invert(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> clone(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> alternate(DoubleListItem<T> a, DoubleListItem<T> b) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> merge(DoubleListItem<T> a, DoubleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<DoubleListItem<T>, DoubleListItem<T>> divideAlternating(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<DoubleListItem<T>, DoubleListItem<T>> divideAlternatingByRuns(DoubleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<DoubleListItem<T>, DoubleListItem<T>> divideByPivot(DoubleListItem<T> list, T pivot, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean check(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public DoubleListItem<T> create(Iterable<T> iterable) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Iterable<T> iterate(DoubleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+}
\ No newline at end of file
diff --git a/src/aud/exam/prep/list/RecursiveSingleListItemProcessor.java b/src/aud/exam/prep/list/RecursiveSingleListItemProcessor.java
new file mode 100644
index 0000000..06a858b
--- /dev/null
+++ b/src/aud/exam/prep/list/RecursiveSingleListItemProcessor.java
@@ -0,0 +1,194 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.Pair;
+
+import java.util.Comparator;
+
+public class RecursiveSingleListItemProcessor<T> extends SingleListItemProcessor<T> {
+
+    @Override
+    public boolean find(SingleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean findBinary(SingleListItem<T> list, T t, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean override(SingleListItem<T> list, T from, T to) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean overrideAll(SingleListItem<T> list, T from, T to) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean overrideAt(SingleListItem<T> list, T to, int index) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void insertInOrder(SingleListItem<T> list, T t, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean remove(SingleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean removeAll(SingleListItem<T> list, T t) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isAscending(SingleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public T max(SingleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public T secondMax(SingleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isItemWiseLessOrEqual(SingleListItem<T> a, SingleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isItemWiseLess(SingleListItem<T> a, SingleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean isLexSmaller(SingleListItem<T> a, SingleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void exchangePairs(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void rotateTriples(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void removeEverySecond(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void doubleAllKeys(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> rotateRight(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> rotateLeft(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public void removeDuplicates(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> invert(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> clone(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> alternate(SingleListItem<T> a, SingleListItem<T> b) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> merge(SingleListItem<T> a, SingleListItem<T> b, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<SingleListItem<T>, SingleListItem<T>> divideAlternating(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<SingleListItem<T>, SingleListItem<T>> divideAlternatingByRuns(SingleListItem<T> list, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Pair<SingleListItem<T>, SingleListItem<T>> divideByPivot(SingleListItem<T> list, T pivot, Comparator<T> cmp) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public boolean check(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public SingleListItem<T> create(Iterable<T> iterable) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+
+    @Override
+    public Iterable<T> iterate(SingleListItem<T> list) {
+        // TODO: Your training
+        throw new RuntimeException("unimplemented");
+    }
+}
\ No newline at end of file
diff --git a/src/aud/exam/prep/list/SingleListItemProcessor.java b/src/aud/exam/prep/list/SingleListItemProcessor.java
new file mode 100644
index 0000000..0ead965
--- /dev/null
+++ b/src/aud/exam/prep/list/SingleListItemProcessor.java
@@ -0,0 +1,6 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.SequenceProcessor;
+
+abstract class SingleListItemProcessor<T> implements SequenceProcessor<T, SingleListItem<T>> {
+}
\ No newline at end of file
diff --git a/test/aud/exam/prep/list/IterativeDoubleListItemProcessorTest.java b/test/aud/exam/prep/list/IterativeDoubleListItemProcessorTest.java
new file mode 100644
index 0000000..8f29fd8
--- /dev/null
+++ b/test/aud/exam/prep/list/IterativeDoubleListItemProcessorTest.java
@@ -0,0 +1,10 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.SequenceProcessorTest;
+
+class IterativeDoubleListItemProcessorTest extends SequenceProcessorTest<DoubleListItem<Integer>> {
+
+    protected IterativeDoubleListItemProcessorTest() {
+        super(new IterativeDoubleListItemProcessor<>());
+    }
+}
\ No newline at end of file
diff --git a/test/aud/exam/prep/list/IterativeSingleListItemProcessorTest.java b/test/aud/exam/prep/list/IterativeSingleListItemProcessorTest.java
new file mode 100644
index 0000000..2279c80
--- /dev/null
+++ b/test/aud/exam/prep/list/IterativeSingleListItemProcessorTest.java
@@ -0,0 +1,10 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.SequenceProcessorTest;
+
+class IterativeSingleListItemProcessorTest extends SequenceProcessorTest<SingleListItem<Integer>> {
+
+    protected IterativeSingleListItemProcessorTest() {
+        super(new IterativeSingleListItemProcessor<>());
+    }
+}
\ No newline at end of file
diff --git a/test/aud/exam/prep/list/RecursiveDoubleListItemProcessorTest.java b/test/aud/exam/prep/list/RecursiveDoubleListItemProcessorTest.java
new file mode 100644
index 0000000..60ab264
--- /dev/null
+++ b/test/aud/exam/prep/list/RecursiveDoubleListItemProcessorTest.java
@@ -0,0 +1,10 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.SequenceProcessorTest;
+
+class RecursiveDoubleListItemProcessorTest extends SequenceProcessorTest<DoubleListItem<Integer>> {
+
+    protected RecursiveDoubleListItemProcessorTest() {
+        super(new RecursiveDoubleListItemProcessor<>());
+    }
+}
\ No newline at end of file
diff --git a/test/aud/exam/prep/list/RecursiveSingleListItemProcessorTest.java b/test/aud/exam/prep/list/RecursiveSingleListItemProcessorTest.java
new file mode 100644
index 0000000..22b76ef
--- /dev/null
+++ b/test/aud/exam/prep/list/RecursiveSingleListItemProcessorTest.java
@@ -0,0 +1,10 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.SequenceProcessorTest;
+
+class RecursiveSingleListItemProcessorTest extends SequenceProcessorTest<SingleListItem<Integer>> {
+
+    protected RecursiveSingleListItemProcessorTest() {
+        super(new RecursiveSingleListItemProcessor<>());
+    }
+}
\ No newline at end of file