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  1. ruby-1.9.2-p290 :017 > i[0] == j[0]
  2. => true
  3. ruby-1.9.2-p290 :018 > i[0].eql? j[0]
  4. => true
  5. ruby-1.9.2-p290 :019 > (i - j).length
  6. => 11
  7.  
  8. It returns all members...
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