utc the example is a poor one and should be removed from the article the article states that it seems to require colors presumably because the grey area cannot simply be colored red yellow or blue without re coloring however it can be colored green and that doesn't require shuffling any of the other colors around this makes it a very misleading counterexample i know i spent a lot of time scratching my head wondering why this was considered a counter example at all and how the caption made any sense please either replace it with an example which does need to be re colored in order to work or remove it not that i don't think it's a valiant attempt but it's just confusing thanks august