Smithsax@24, I take it you mean the difference between a quarter and a half. If so, imho, that is taking things too far AND colour in the preamble should be, in both instances, pluralised. If, however, you are correct, this final end game pushes that bl**dy hare into second place as one of the most ridiculous requirements ever!!!! There has to be a limit to the cryptic allusion of what is required and I do not think there is sufficient information in the preamble to justify any differentiation within each sequence --- I appreciate your suggestion, but I just needed a rant wrt ambiguous instructions to a relatively straightforward gridfill.