OK, now that I can see the pattern you want, only a few small adjustments to what I posted before are needed. The duplicate code paths you used aren’t necessary.
TrueFalse_SkipPattern_2019Nov17b.gh (17.5 KB)
Dispatch is not used for this. By the way, those two sliders for ‘Extent X’ and ‘Extent Y’ have upper limits of 1000, which can easily result in accidental settings that are SLOW.