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redsquirrel/gist:11025

Created September 16, 2008 12:49
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gistfile1.rbx
arr = [1,1,2,2,3,3,4,5]
require 'set'
dups = Set.new
arr.each_with_index { |n, i| dups << n if n == arr[i+1] }
dups # [1, 2, 3]
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