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# Oh, and...
Only when the subtractive digit is 1 x 10^n, not 5 x 10^n. So IX is OK, but VL isn't.

It's all very simple.
(Vice Admiral Sir Charles Cockbrush KCB MBE DSO, who is finding it increasingly difficult to log into b3ta.com wants to duck your aunt and kick your puppy, Thu 2 Sep 2010, 12:30, archived)