[r-t] Plain Bob leadheads

Mark Davies mark at snowtiger.net
Fri Feb 19 09:14:09 GMT 2021

Please can someone produce, or point me at, a concise proof of this lemma:

PB1: In a palindromic treble-dominated method with Plain Bob leadheads, 
on an even number of bells, the lead end place notations must be 12 or 1n.

Thank you!


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