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Code Duplication    Length = 9-9 lines in 3 locations

tests/Perfs/ForeachMethodCollection.php 3 locations

@@ 109-117 (lines=9) @@
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    /**
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     * {@inheritdoc}
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     */
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    public function flip()
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    {
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        $collection = Factory::create([], static::class);
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        foreach ($this->items as $key => $value) {
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            $collection->set($value, $key);
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        }
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        return $collection;
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    }
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    /**
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     * {@inheritdoc}
@@ 122-130 (lines=9) @@
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    /**
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     * {@inheritdoc}
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     */
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    public function values()
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    {
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        $collection = Factory::create([], static::class);
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        foreach ($this->items as $value) {
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            $collection->add($value);
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        }
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        return $collection;
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    }
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    /**
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     * {@inheritdoc}
@@ 135-143 (lines=9) @@
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    /**
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     * {@inheritdoc}
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     */
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    public function keys()
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    {
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        $collection = Factory::create([], static::class);
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        foreach ($this->items as $key => $value) {
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            $collection->add($key);
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        }
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        return $collection;
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    }
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    /**
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     * {@inheritdoc}