User blog comment:Wythagoras/Dollar function: final version/@comment-5029411-20131209004113

Stronger Linear Array Notation:

@ is any array between seperators

4. a$[b+1 @]c = a$[b @]c...[b @]c (a [b @]c's)

7. a$[[0...0,b @] ] = a$[[0...[0...0,b-1 @][0...0,b-1 @] ...[0...0,b-1 @] [0...0,b-1 @]... ,b-1 @] ] (a nested)

8. [@ 0] = [@]