This is Coxeter version 3.1.

Enter help if you need assistance, carriage return to start the program.

coxeter : 

type : 

rank : coxeter : enter your element (finish with a carriage return) :

213

coxeter : enter your element (finish with a carriage return) :

h[0] = 1  h[1] = 3  h[2] = 3  h[3] = 1  

size : 8

coxeter : coxeter :