Base rules

Legend:
# = arbitrary length array of any number
$ = arbitrary length array of ones

Definition

This is a continuation of last part so we ended off with the double commas, now lets do 2 of them.
[a, b/c,,d,,e,f] = [a, b/c,,d,e,e...(f times)...e,e] =  [a, b/c,d,d...([e,e/e,e...(f-2 times)...e,e] times)...d,d]