I humbly ask ...
Is there a post somewhere that describes how the following syntax of Flatten works? I'm having trouble understanding this from what is described on the Flatten documentation page.
Flatten[list, { {s11,s12,...},{s21,s22, ...}, ...}]
flattens list by combining all levels sij to make each level i in the result
The related examples didn't help my understanding.
Perhaps I'm also not understanding the meaning of Level 1, level 2, ... and the concept of outermost, innermost.
