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word="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
chars=Array.new
for i in (0..word.size-1)
chars[i]=word[i].chr
end
puts word[61].chr
chars.each do |c1|
chars.each do |c2|
chars.each do |c3|
chars.each do |c4|
puts c1.to_s+c2.to_s+c3.to_s+c4.to_s
end
end
end
end
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