gap> F:=(1,3,2); R:=(1,4,3); D:=(2,3,4); L:=(1.2.4);
(1,3,2)
(1,4,3)
(2,3,4)
Syntax error: ) expected
F:=(1,3,2); R:=(1,4,3); D:=(2,3,4); L:=(1.2.4);
                                         ^
gap> F:=(1,3,2); R:=(1,4,3); D:=(2,3,4); L:=(1,2,4);
(1,3,2)
(1,4,3)
(2,3,4)
(1,2,4)
gap> h1:=F*R^-1;h2:=D*R^-1;h3:=L*F^-1;
(1,4)(2,3)
(1,3)(2,4)
(1,3)(2,4)
gap> h4:=L*R^-1;h5:=D*L^-1;h6:=D*R^-1;
(1,2)(3,4)
(1,4)(2,3)
(1,3)(2,4)
gap> G:=Group(h1,h2,h3,h4,h5,h6);
Group( (1,4)(2,3), (1,3)(2,4), (1,3)(2,4), (1,2)(3,4), (1,4)(2,3), (1,3)
(2,4) )
gap> Size(G);
4
gap> h7:=F*D^-1; 
(1,2)(3,4)
gap> G:=Group(h1,h2,h3,h4,h5,h6,h7);
Group( (1,4)(2,3), (1,3)(2,4), (1,3)(2,4), (1,2)(3,4), (1,4)(2,3), (1,3)
(2,4), (1,2)(3,4) )
gap> Size(G);
4
gap> Z:=Centre(G);
Subgroup( Group( (1,4)(2,3), (1,3)(2,4), (1,3)(2,4), (1,2)(3,4), (1,4)(2,3), 
(1,3)(2,4), (1,2)(3,4) ), [ (1,2)(3,4), (1,3)(2,4) ] )
gap> Size(Z);
4
gap> IsCyclic(G);
false
gap> quit;