User blog comment:Wythagoras/FGH comparisons/@comment-5150073-20130826155600

For BEAn, it's not as simple as you probably think: {n,n // 2} expands to X && X && X && X...X && X && X && X && n (with n-1 &&'s). The limit of {n,n / 2}, {n,n / 1 / 2}, {n,n / 1 / 1 / 2} is {n,n (/1) 2} (or {X,X / 2}*X & n, using structures).