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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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# See GHs ISAAC'91 paper.
# An example of a case where No:-1; is clearly not good.

Enum: J2 (Hall-Janko);
Gr: a,b,c;
Rel: a^3, b^3, c^3, abaBAB, (ca)^5, (cb)^5, (cBcb)^2, 
  AbacAbaCABaC, abAcabACaBAC;
Subg: Index 100;
Gen: a,b,b^(cAc);

Mess:10000;

Felsch;  End;		# m=1305 t=1315
No:-1;   End;		# m=2448 t=2473

Fel:1;   End;		# m=459 t=477
No:0;    End;		# m=432 t=450
No:6;    End;		# m=350 t=367

Max:500;
Com:100;

# We include the first 4 (?best value) relators in the subgroup,
#   and use Mend:1 to give `plenty' of (variable) early defns.

No:4;
Mend:1;
Aep:7;			# `best': m=245 t=270