Quelle  3gp-SP-2-Rel-i

#Example: "3gp-SP-2-Rel-i" . . . based on: isom/3gp.ex2
#vars: F, rels, procId;
#options: OutputLevel, ClassBound, StandardPresentationFile
F := FreeGroup("x", "y");
rels := ["(x * y * x)^3", "[y, x, x]"];
procId := PqStart(F : Prime := 3, Relators := rels);
#comment: set a different print level by supplying <OutputLevel>
#add <OutputLevel> for <value> if set and ok
#PqSetOutputLevel(procId, value);;
PqSPComputePcpAndPCover(procId : ClassBound := 1);;
#comment: set a different `ClassBound' by supplying <ClassBound>
#comment: also save the presentation to a file by supplying <StandardPresentationFile>
PqSPStandardPresentation(procId, [ [[2,0],
                                    [0,2]],

                                   [[0,2],
                                    [1,0]],

                                   [[1,2],
                                    [2,2]],

                                   [[1,0],
                                    [2,1]],

                                   [[2,0],
                                    [0,1]] ]

                         : # options
#add <StandardPresentationFile> for <value> if set and ok
#                          StandardPresentationFile := value,
#sub <ClassBound> for <9> if set
                           ClassBound := 9,
                           PcgsAutomorphisms);;