"Source: Text/Geometry/GrpPSL2.text";
"Line: 244";
"Date: Tue Jun  7 22:27:14 2016";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Geometry/GrpPSL2.text, line: 244
// Example: H142E2 ()
print "Example: H142E2";
ei := GetEchoInput();
SetEchoInput(true);
G := PSL2(Integers());
H := CongruenceSubgroup([2,3,6]);
H;
K := CongruenceSubgroup(0,5);
K meet H;
SetEchoInput(ei);
