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Code Duplication    Length = 9-9 lines in 2 locations

DataStructures/Lists/Queue.php 1 location

@@ 71-79 (lines=9) @@
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        }
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        $newNode = new Node($data);
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        if($this->head === null) {
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            $this->head = &$newNode;
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            $this->tail = &$this->head;
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            $newNode->next = &$this->tail;
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        } else {
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            $this->tail->next = &$newNode;
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            $newNode->next = &$this->head;
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            $this->tail = &$newNode;
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        }
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        $this->size++;
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    }
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DataStructures/Lists/CircularLinkedList.php 1 location

@@ 69-77 (lines=9) @@
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     */
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    private function insertBeginning($data) {
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        $newNode = new Node($data);
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        if($this->head === null) {
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            $newNode->next = &$this->head;
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            $this->head = &$newNode;
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            $this->tail = &$newNode;
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        } else {
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            $this->tail->next = &$newNode;
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            $newNode->next = &$this->head;
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            $this->head = &$newNode;
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        }
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    }
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    /**