| #### D.15.7.7 grtwist Procedure from library `gradedModules.lib` (see gradedModules_lib). Usage: grtwist(a,d), int a, d Return: graded object representing S(d)^a Purpose: compute presentation of S(d)^a Example:
    LIB "gradedModules.lib";
    ring r=32003,(x,y,z),dp;
    //  grview(grpower( grshift(grzero(), 10), 5 ) );
    grview( grtwist (5, 10) );
    ==> Graded homomorphism: r(10)^5 <- 0, given by zero (5 x 0) matrix.

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