User blog comment:Ikosarakt1/BEAN is much stronger/@comment-5529393-20130613095744/@comment-5150073-20130613104308

Yes, [1 [1 --| 1 --| 2] 2] corresponds to {X,X / 2}, there is no problem. But adding, say, backslash to the left of [1 --| 1 --| 2]: [1 \ 2 [1 --| 1 --| 2] 2] doesn't seems to lead to {X,X // 2} (as Bird said), rather I think that [1 \ 2 [1 --| 1 --| 2] 2] ~ {X,X / 2}^^X, which is different structure.