.
idea i got from that PDF:
write the results in 4 sets of 3 from left to right. need 12 decisions to do so
example:
BPB PBB BBB BPB
_ _ _ _
WHERE YOU SEE AN UNDERLINE bet for a repeat of above. 1 2 4 8 progression
so you are trying to match the 3rd decision of each set. 4 bets only every 12 decisions