| #### D.6.8.2 Semigroup Procedure from library `classifyci.lib` (see classifyci_lib). Usage: Semigroup(l); I is an ideal Purpose: Computes the semigroup of the ideal I corresponding to each branch Return: list of semigroup of ideal I corresponding to each branch Example:
    LIB "classifyci.lib";
    ring R=0,(x,y,z),ds;
    ideal I=x2+y3+z5,yz;
    Semigroup(I);
    ==> [1]:
    ==>    2,3
    ==> [2]:
    ==>    2,5

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