F27-fel1

# ACEExample "F27-fel1" : enumeration of cosets of H in G,
# where G = F(2,7) = C_29, H = Id, using felsch := 1 strategy.
#
local F, G, a, b, c, d, e, x, y;
# We define F(2,7) on 7 generators
F := FreeGroup("a","b","c","d","e", "x", "y"); 
     a := F.1;  b := F.2;  c := F.3;  d := F.4; 
     e := F.5;  x := F.6;  y := F.7;
G := F / [a*b*c^-1, b*c*d^-1, c*d*e^-1, d*e*x^-1, 
          e*x*y^-1, x*y*a^-1, y*a*b^-1];
return ACEfunc(
    FreeGeneratorsOfFpGroup(G), 
    RelatorsOfFpGroup(G), 
    [] # Generators of identity subgroup (empty list)
    # Options that don't affect the enumeration
    : echo, enum := "F(2,7), aka C_29", subg := "Id", 
    # Other options
    wo := "2M", mess := 25000, felsch := 1);