User blog comment:Hyp cos/Analysis - BEAF, FGH and SGH (part 3)/@comment-10429372-20131102091704

I found some similarities with HAN:

{X,X+1(1)2}&n, X arrays work similiar to w/, [1]w/[2] is also w+1 entries.

The Xn works similiar to [n], both nests arrays of the weaker version.