Hecke( WF, H )
Hecke( WF, params )
Construct  a  Hecke coset  a Coxeter   coset  WF and  an Hecke  algebra
associated to the CoxeterGroup of WF. The  second form is equivalent to
Hecke( WF, Hecke(CoxeterGroup(WF), params)).
This function requires the package "chevie" (see RequirePackage).
GAP 3.4.4