| #### D.6.21.1 isCMcod2 Procedure from library `spcurve.lib` (see spcurve_lib). Usage: isCMcod2(i); i an ideal Return: presentation matrix of i, if i is Cohen-Macaulay of codimension 2 a zero matrix otherwise Example:
    LIB "spcurve.lib";
    ring r=32003,(x,y,z),ds;
    ideal i=xz,yz,x^3-y^4;
    print(isCMcod2(i));
    ==> -y,-x2,
    ==> x, y3,
    ==> 0, z

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