[VA] SRC #012a - Then and Now: Probability

[ttw]

I am assuming that the probabilities are equal for all branches from any point but the bottom row. (The probabilities fall into various classes depending on the location of the points.) I also assume that the bottom row is an absorbing barrier; the red lines on the border have probability zero (or are non-existent.)

The point being that it's not a copy of a Quincunx.