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
Assuming you are using the standard English alphabet, the number of combinations you can make are: 26 x 26 = 676 combinations.
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.