| #### D.15.31.2 preim Procedure from library `tropicalEllipticCovers.lib` (see tropicalEllipticCovers_lib). Usage: preim(O, x); O list, x poly/number Assume: O is a list of ordering of the set of vertices (or indices of the vertices), x is a monomial representing a vertex of a graph (or the index of the vertex we are interested in). Return: int. Theory: This gives the entry number of x in list O. Example:
    LIB "tropicalEllipticCovers.lib";
    ring r=0,(x1,x2,x3,x4),dp;
    preim(list(x1,x3,x4,x2),x2);

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