:- ensure_loaded( gamma_sf ). test_gamma :- between( 1, 4, M), between( 1, 10, S), Iters = 100, findall( G, (between(1,Iters,_),gamma(M,S,G)), Gs ), sumlist( Gs, Sum ), AG is Sum / Iters, debug( _, '~w:~w:~w', [M,S,AG] ), fail.