User blog comment:Wythagoras/Dollars function/@comment-5029411-20130709185545

Ultimate Array Notation IV:

a$[0]@&0...0,0,b+1@c+1@ = a$[0]@&0...0,...,[0]@& 0...0,[0],b[0]&0...0,0,b+1@c@...b [0]&0...0,0,b+1@c@ (a nested)

&@ 0 = &@