FusionCharTableTom( tbl, tom )
FusionCharTableTom
determines the fusion of the classes of elements
from the character table tbl into classes of cyclic subgroups on the
table of marks tom.
gap> a5c := CharTable( "A5" );; gap> fus := FusionCharTableTom( a5c, a5 ); [ 1, 2, 3, 5, 5 ]
GAP 3.4.4