Then of course there is always regional variations to consider. Where as West Yorkshire RA is mostly composed of single cups, meandering grooves and the occasional ring (sometimes two) multiple rings are rare. I can only think of a handful of examples in WY - whereas multiple rings are much more common in Northumbria and Scotland. Then of course there are complete swerveballs such as the Ilkley Ladder, the 'pitchfork' motif and plane old oddness like the Hangingstones design. All within a few hundred yeards on the northern edge of Ilkley Moor.
I also don't see any problem with RA having multiple purposes too. rather than single definitions.
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