GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
2 extreme rays 2 support hyperplanes embedding dimension = 5 rank = 2 external index = 1 grading: -1 -1 0 0 0 degrees of extreme rays: 1: 2 *********************************************************************** 2 extreme rays: 0 -1 1 0 0 1 -2 3 -1 0 2 support hyperplanes: -2 -1 0 0 0 1 0 0 0 0 3 equations: 1 0 0 1 0 0 1 1 1 0 0 0 0 0 1 2 basis elements of lattice: 1 0 1 -1 0 0 1 -1 0 0