Though the front page says "dual," the article it links to properly says "duel."
Is the distinction really that hard, guys? It's the difference between "dual," meaning "of two"--like a dual meet--and "duel," meaning "a battle"--like pistols at dawn.
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Oh, and while I'm ranting: the correct spellings are "supersede" and "minuscule." At present it seems these are being misspelled about as often as "ridiculous."