PrintSISYPHOSWord( P, a )
For a polycyclically presented group P and an element a of P,
PrintSISYPHOSWord( P ,a ) prints a string that encodes a in the
input format of the SISYPHOS system.
"1" means the identity element, the other elements are
products of powers of generators, the i-th generator is given the
gap> g := SolvableGroup ( "D8" );; gap> PrintSISYPHOSWord ( g, g.2*g.1 ); Print( "\n" ); g1*g2*g3
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