You found a safe. There's a numeric keypad on it...
The keypad is dirty, thanks to this you can easily spot that numbers
8 are frequently used. It's so clear that you guess no
other digit is in use in this code.
Write a script printing all combinations of
4 digits that use all of
those used digits.
Output one combination per line, separate digits using spaces, so your output should look like:
1 1 5 8 1 5 5 8 1 5 8 8 ...