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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