"Source: Text/Group/GrpAtc.text";
"Line: 1611";
"Date: Thu Sep 25 14:47:45 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Group/GrpAtc.text, line: 1611
// Example: H84E19 ()
print "Example: H84E19";
ei := GetEchoInput();
SetEchoInput(true);
F<x,t,y,u> := FreeGroup(4);
ish, dehn := IsHyperbolic(F, [x^2*t, y^2*u, u^-2*y], [t^2, (x*y)^7, (x,y)^3]);
ish, dehn;
SetEchoInput(ei);
