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modifying a list
hi I am new to prolog. I have a problem in which I have a list of items[a,b,c,d,e,f,g]. Now say each item has its own category a b,d are all cat 1 items while e,g are cat 2 and c is cat 3 while f is cat 4. I want to reduce this list in such a way that it contains at most 2 items from any...
