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beg your pardon - wrong post.

Finn. I see x - whatever you do with it it affects previously highlighted cells I can't see it matters which of the two possible ways you choose to hide it. Still no nearer finding the significance of the yellow shaded cells - red herrings??

@Don.Perhaps the shaded cells are there to help get the phrase, as different kinds of k(3) and o(2)??

Right - well spotted.