gistfile1.txt

[1, 2, 3].each do |n1|
  if n1 == 1
    [1, 2, 3].each do |n2|
      if n2 == 2
        [1, 2, 3].each do |n3|
          if n3 == 3
            [1, 2, 3].each do |n4|
              if n4 == 4
                print n1, n2, n3, n4
              end
            end
          end
        end
      end
    end
  end
end