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# digit_letters is defined as in the original
def go():
...
    for (letter_set) in letter_sets:
      answers.append(''.join(letter_set)) # combine the four letters
    print number_set, ", ".join(answers)

for (four_numbers) in Carteisian([2..9]*[2..9]*[2..9]*[2..9]):
  print four_numbers
  for (four_letters) in Cartesian(the letters for four_numbers):
    print four_letters