It's not as simple as that - because of the bedding planes - somewhere between four and six, perhaps. And then there's the wall stones that retain a bank and those carved fragments that have been pointed or rendered.
might be higher than that, as if you were a stonemason wanting to make a good job, you wouldn't want those silly squiggly bits showing...
(I used to like to imagine I had some RA in my old house in Wooler - not impossible)
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