| #### D.4.8.10 lsum Procedure from library `ellipticcovers.lib` (see ellipticcovers_lib). Usage: lsum(L); L list Assume: L is a list of things with the binary operator + defined. Return: The sum of the elements of L. Theory: Sums the elements of a list. Eventually this will be deleted and become a more efficient kernel function. Example:
    LIB "ellipticcovers.lib";
    list L = 1,2,3,4,5;
    lsum(L);
    ==> 15

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