Having returned from a weekend away, I have only just seen your original post. As Alan Turing suggests, we are not all poised at our computers ready to respond as soon as you write. That doesn’t mean we are not interested.

As some other contributors will know, in the mid 1960s, I worked with a group of friends to do similar comparisons, so your conclusions are of great interest – especially as I see you have found some things exactly as I did all those years ago.

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