| #### D.13.2.36 rays Procedure from library `gfan.lib` (see gfan_lib). Usage: rays(c); c cone Return: bigintmat, generators of the rays of c, orthogonal to its lineality space Example:
    LIB "gfan.lib";
    intmat M1[2][2]=
    1,0,
    0,1;
    cone c1=coneViaPoints(M1);
    bigintmat R1=rays(c1);
    print(R1);
    ==> 1,0,
    ==> 0,1
    intmat M2[3][2]=
    1,0,
    0,1,
    -1,0;
    cone c2=coneViaPoints(M2);
    bigintmat R2=rays(c2);
    print(R2);
    ==> 0,1

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