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Jun 24th, 2019
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  1. > a = LinkedList([1, 2, 3])
  2. > a.head = 4
  3. > a.to_a
  4. [4, 2, 3]
  5.  
  6. > a = LinkedList([1, 2, 3])
  7. > a.rotate_right(1).rotate_left(1).head = 4
  8. > a.to_a
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