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  1. 2.2.7 :011 > a = [1,2,3,4]
  2. => [1, 2, 3, 4]
  3. 2.2.7 :012 > a[0...-1].collect do |x|
  4. 2.2.7 :013 > x.to_s
  5. 2.2.7 :014?> end
  6. => ["1", "2", "3"]
  7. 2.2.7 :015 >
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