Every time I have to do this I "invent" a different way. Time to standardize. I suspect there is some default command I overlooked ready to do this, so I am sorry in advance if the question is too trivial.
What is the better (memory, performance) way to get:
combinations[{1,2,3},2] = {{1,2},{1,3},{2,3}}
with arbitrary elements in the input list, of course.
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