Subset permutations and subsequent runtime analysis

Question

I have 2 questions:

• I would like to generate permutations of subsets, for example. There are 20 possible amino acids and 5 positions where they can occur. What are the complete permutations that may arise (in the text)

• Once I have this list of permutations, some values ​​will be evaluated for each of them, and I would like to see any given permutation at runtime. The first idea that comes to mind is a lookup table, but I was wondering if there could be a better way to do this.

Answer 1

• 5, . , . CombinationGenerator, .

• 20 ( ). -, , .