sentences:  This decomposition is based on a Petrie polygon projection of a 30-cube.A hexacontagram is a 60-sided star polygon.There are 7 regular forms given by Schläfli symbols {60/7}, {60/11}, {60/13}, {60/17}, {60/19}, {60/23}, and {60/29}, as well as 22 compound star figures with the same vertex configuration.