WordBraid( b )
b is a braid element which must be in the braid monoid.
returns as a list of indices the list of generators of the braid monoid
B(W) of which b is an element (the group W can be obtained by
gap> W := CoxeterGroup( "A", 3 );; gap> b := Braid( W )( [ 2, 1, 2, 1, 1 ] ); 121.1.1 gap> WordBraid( b ); [ 1, 2, 1, 1, 1 ]
This function requires the package "chevie" (see RequirePackage).
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