In SAS IML there is a function called ALLCOMB that can create a matrix of all possible combinations. This is a very helpful function but if the number of combinations is for n=large it doesn't work as well from an efficiency point of view. I was wondering if any one has created hash tables of all possible combinations to improve the efficiency. I know how to either use allcomb or do loops to create a matrix but instead I would like to create a Hash table lookup of the combinations in each row. Thanks
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