GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
16 extreme rays 24 support hyperplanes embedding dimension = 7 rank = 7 (maximal) external index = 1 internal index = 1 original monoid is not integrally closed witness for not being integrally closed: 1 1 1 1 1 1 2 grading: 1 1 1 1 1 1 -2 degrees of extreme rays: 1: 16 *********************************************************************** 16 extreme rays: 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 1 1 0 1 1 0 0 1 1 1 0 1 0 1 0 0 0 0 0 0 1 0 0 1 1 1 0 1 0 1 1 0 1 0 1 1 0 0 1 1 1 0 0 0 0 0 0 1 0 0 0 1 1 1 1 0 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 0 1 1 1 1 0 0 0 1 24 support hyperplanes: 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 1 1 0 1 -1 0 0 1 1 1 0 -1 0 1 0 0 0 0 0 0 1 0 0 1 1 -1 0 1 0 1 1 0 -1 0 1 1 0 0 1 -1 0 1 1 1 1 1 -2 1 0 0 0 0 0 0 1 0 0 0 1 1 -1 1 0 0 1 0 1 -1 1 0 1 0 1 0 -1 1 0 1 1 1 1 -2 1 1 0 1 0 0 -1 1 1 0 1 1 1 -2 1 1 1 0 0 0 -1 1 1 1 0 1 1 -2 1 1 1 1 0 1 -2 1 1 1 1 1 0 -2 1 1 1 1 1 1 -3