In fact, I have two lists: let's say L and N.
An elements (or set) of N must be added to L, if and only if it is not a subset of an element of L.
I think that the code you wrote does that, for each element of separately.
Couldn't this be a solution: add all the elements of N to L, and afterwards eliminate the sets which are present more than once? How could one eliminate these sets?
Thanx for your help...
P.
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