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→Solution: via media : solvé et coagula
===Solution===
===Solution===
[http://mathforum.org/kb/plaintext.jspa?messageID=6514666 Solution posted by Jon Awbrey, proceeding by way of logical graphs].
[http://mathforum.org/kb/plaintext.jspa?messageID=6514666 Solution posted by Jon Awbrey, using the method of logical graphs].
In logical graphs, the required equivalence looks like this:
In logical graphs, the required equivalence looks like this: