"Source: Text/Group/GrpAtc.text";
"Line: 1686";
"Date: Thu Sep 25 14:47:45 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Group/GrpAtc.text, line: 1686
// Example: H84E21 ()
print "Example: H84E21";
ei := GetEchoInput();
SetEchoInput(true);
F<a, b>:= FreeGroup(2);
ish, dehn, D1, D2:= IsHyperbolic(F, [b^3], [a^2, (a*b)^7]);
ish, dehn;
isid, wd := IsIdentity((a*b^2)^6,D1);
isid, wd;
isid, wd := IsIdentity(b^-1*(a*b^2)^6*a,D1);
isid, wd;
SetEchoInput(ei);
