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$\begingroup$I want to say "B with the 1 o'clock and 2 o'clock pieces inverted". It would make perfect sense! Rot13(Ebgngr svefg ebj pybpxjvfr naq nqq vg gb frpbaq ebj)$\endgroup$
$\begingroup$@jafe. The pattern you described is not the one I intended, but I must say I also don't see the one you suggest. Do you mind being a slight bit more specific: are you following it vertically or horizontally? The one I intended works both ways...$\endgroup$