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Code Duplication    Length = 10-11 lines in 2 locations

Source/Traversable.php 2 locations

@@ 342-351 (lines=10) @@
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        );
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    }
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    public function join($values)
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    {
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        return new Connectors\JoiningTraversable(
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                $this->scheme,
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                $this->scheme->joinIterator(
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                        $this->elements,
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                        $this->scheme->toIterator($values)
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                ),
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                $this->scopedSelfFactory());
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    }
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    public function groupJoin($values)
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    {
@@ 353-363 (lines=11) @@
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                $this->scopedSelfFactory());
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    }
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    public function groupJoin($values)
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    {
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        return new Connectors\JoiningTraversable(
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                $this->scheme,
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                $this->scheme->groupJoinIterator(
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                        $this->elements,
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                        $this->scheme->toIterator($values),
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                        $this->scopedSelfFactory()
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                ),
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                $this->scopedSelfFactory());
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    }
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    public function unique()
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    {