I think the "from A to B" refers to the TYPES of hints they were looking for in the text ("A to B" not literally being one of them)....the list below in that post is what they were referring to.
Like if I said I was looking at "a direction was advised" hints and then listed times people spoke a direction. "Go west" "seems to be blowing from north" etc. (Or whatever was actually said)
I think they just noticed there were several times something was written in an "A to B" sort of format and wondered if maybe there was something worth looking further into it and listed examples of what they meant.