This is from memory, use at your own risk.
snap snap snap snap
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---------------2--3----------------------4--5---------------
---------3--5----------------------5--7---------------------
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snap snap
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---------------4--5----------4--5--------2--3---------------
---------5--7----------5--7--------3--5---------------------
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Richard A. Griffiths ...uunet!ingr!b11!xanth!richard (UUCP)