Just 1. The solution is a set of 81 integers, comprising 9 lots of the digits 1 to 9.
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252 combinations, :)
Four outcomes, three combinations.
9
Just 4: 123, 124, 134 and 234. The order of the numbers does not matter with combinations. If it does, then they are permutations, not combinations.
Assuming you are using the standard English alphabet, the number of combinations you can make are: 26 x 26 = 676 combinations.