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Nothin' to tell. They do work. About 2/3 of the time, they work right away.

There are 12 colo(u)rs in Easter Egg 215. 11 of those colo(u)rs work. I haven't yet found a phrasing of colo(u)r 12 that works. Either I'm not clever enough, or that choice just got left out. Or possibly both of course.