| #### D.14.2.1 intersectLists Procedure from library `combinat.lib` (see combinat_lib). Usage: intersectLists(L,M); L list, M list Return: list, containing all elements of L which are elements of M Theory: we require the elements of the lists to have a compare operator ==. Example:
    LIB "combinat.lib";
    intersectLists(list(1,1,2,2,3),list(2,3,3,4));
    ==> [1]:
    ==>    2
    ==> [2]:
    ==>    3
    intersectLists(list(1,1,2,2,3),list(1,1,2,2,3));
    ==> [1]:
    ==>    1
    ==> [2]:
    ==>    2
    ==> [3]:
    ==>    3

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