User blog comment:DrCeasium/HAN: better definitions/@comment-5029411-20130707005209

Extension of Hyperfactorial Extended Array Notation.

a![1,@1...1,@1,@+1b+1] = a![1,@1...1,@,<... < 21> ... 1>,@+1b]

,1 = ,


 * ,a1,b* = *,b*, a < b.

a? = a![a,[a, ... [a, aa] ... a] a] (a nested)