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Jan 22nd, 2015
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  1. Input:
  2. [
  3.   ['a', 'b', 'c'],
  4.   ['d', 'e'],
  5.   ['c', 'e'],
  6.   ['f', 'g']
  7.   ['g', 'j']
  8. ]
  9.  
  10. ======================================
  11. Output:
  12. [
  13.   ['a', 'b', 'c', 'd', 'e'],
  14.   ['f', 'g', 'j']
  15. ]
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