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

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#Example: "2gp-a-Rel-i" . . . based on: examples/keyword_2gp
#vars: F, rels, procId;
#options: OutputLevel, ClassBound
F := FreeGroup(3, "x");
rels := ["x1^x2 * x3", "[x2, x1, x1]", 
         "[x2 * [x2, x1] * x1^2, x1 * x2 ]"];
procId := PqStart(F : Prime := 2, Relators := rels);
#comment: set a different `ClassBound' by supplying <ClassBound>
#comment: also set a different print level by supplying <OutputLevel>
#sub <ClassBound> for <3> if set and ok
PqPcPresentation(procId : ClassBound := 3, 
#sub <OutputLevel> for <1> if set and ok
                          OutputLevel := 1);;