User blog comment:Syst3ms/A formal interpretation of Y sequence : F sequence/@comment-35470197-20190810061448/@comment-35470197-20190810140543

I might be confused now. I agree that the difference sequence of (1,2,4,2,4) is (1,2,1,2) by 3.3.1. Then how do you continue the computation? Since the third entry 1 does not has a parent, I could not understand which line to go.