User blog comment:Ubersketch/Section Notation/@comment-36957202-20190329205010/@comment-37246647-20190331091515

An example of how this would work, which I do believe is your intent:

[[[4]r2]r3][[[[6]r2]r4]r2]=[[8]r3][[[12]r4]r2]=[24][[48]r2]=[24][96]=120