 For 4[4]2 has R14 = R22 = I, (R2R1)2 = (R1R2)2.For 3[5]3 has R13 = R23 = I, (R2R1)2R2 = (R1R2)2R1.Coxeter also generalised the use of Coxeter-Dynkin diagrams to complex polytopes, for example the complex polygon "p"{"q"}"r" is represented by and the equivalent symmetry group, "p"["q"]"r", is a ringless diagram .