| #### D.12.2.42 find_index Procedure from library `crypto.lib` (see crypto_lib). Usage: find_index(a, e) Return: Returns the list index of element e in list a. Returns 0 if e is not in a Example:
    LIB "crypto.lib";
    list a = 1,5,20,6,37;
    find_index(a,20);
    ==> 3
    find_index(a,6);
    ==> 4
    find_index(a,100);
    ==> 0

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