User blog comment:Wythagoras/Dollars Function/@comment-5029411-20130808225317

Aarex's Ultimate Array Notation III idea:

▲ is any | symbol

20. {0}|0(b+1•)|▲c+1• = {0}|0(b•)|{0}(b+1•)▲1(b+1•)|▲c•... (b+1•)▲1(b+1•)|▲c• (b+1•)▲1(b+1•)|▲c• (a nested)

21. {0}|0(0)▲• = {0}|0▲•

22. {0}|0▲(•)|•...|•▲•, if 0 |•'s = {0}|0▲▲•