| #### D.13.2.42 uniquePoint Procedure from library `gfan.lib` (see gfan_lib). Usage: uniquePoint(c); c cone Return: bigintmat, a unique point in c stable under reflections at coordinate hyperplanes Example:
    LIB "gfan.lib";
    intmat M1[2][2]=
    1,0,
    0,1;
    cone c1=coneViaPoints(M1);
    uniquePoint(c1);
    ==> 1,1
    intmat M2[2][2]=
    -1,0,
    0,1;
    cone c2=coneViaPoints(M2);
    uniquePoint(c2);
    ==> -1,1

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