"Source: Text/Group/Grp.text";
"Line: 2156";
"Date: Thu Sep 25 14:47:45 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Group/Grp.text, line: 2156
// Example: H64E19 ()
print "Example: H64E19";
ei := GetEchoInput();
SetEchoInput(true);
Q<s,t,u>, h := Group< s, t, u |
    t^2, u^17, s^2 = t^s = t, u^s = u^16, u^t = u >;
Order(Q);
assert $1 eq 68;
FactoredOrder(Q); 
S := sub< Q | t*s^2, u^4 >;
Index(Q, S);
assert $1 eq 4;
#S;
assert $1 eq 17;
SetEchoInput(ei);
