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I took these photos 22/6/23 at Arnside Knott. The 3rd spot is missing altogether. Is it an Ab.?

The third spot is usually much smaller, often merely a pinprick so for it to be completely absent probably isn't that unusual..... although knowing those nutty ab obsessed victorians it probably has a name!

I regularly see them with that spot missing. It may well be classed as an ab. but it shouldn't be given how regularly it occurs.

Thanks for the info guys