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Aug 30th, 2013
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  1. irb(main):009:0> a = [[1]]
  2. => [[1]]
  3. irb(main):010:0> b = a.dup
  4. => [[1]]
  5. irb(main):011:0> b[0][0]=2
  6. => 2
  7. irb(main):012:0> a
  8. => [[2]]
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