[ {
  "invoked" : 27,
  "entryPoint" : "h11.User#getPlayedSongs()",
  "arguments" : [ ],
  "calls" : [ {
    "id" : 6,
    "methodCalls" : [ {
      "methodName" : "song",
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        "return" : 2,
        "parameter" : [ ]
      } ]
    } ]
  }, {
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        "parameter" : [ ]
      } ]
    } ]
  }, {
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        "parameter" : [ ]
      } ]
    } ]
  }, {
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        "parameter" : [ ]
      } ]
    } ]
  }, {
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      } ]
    } ]
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      "id" : 7
    }, {
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      "type" : "java.lang.Double",
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      "id" : 8
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      "id" : 26
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    "id" : 27
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  "expected" : {
    "type" : "java.util.ImmutableCollections$ListN",
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} ]