User blog:Ubersketch/Section Notation

n - add n [ - start section ] - end section rn - repeat preceding section (#) - write string # s - current amount of n added

these symbols are the only legal symbols when writing in this notation, and every [ must have a ], and vice versa.

For example, [3[([)r3(3)[(]r3)]r3 = [[[3]r3]r3]r3