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Generate sequential permutations

View permutation.rb
1 2 3 4 5 6 7
#!/usr/bin/env ruby
 
length = 6
chars = [ 'a'..'z', 'A'..'Z', 0..9 ].map(&:to_a).flatten
sequencer = chars.repeated_permutation length
 
loop { puts sequencer.next.join '' }
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