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Incorrect use of the word oblige and term M.O.
You were a dick with the "No comments" remarks, and this didn't need to be x-posted here.
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I'm pretty sure that "I obliged him" meaning
http://dictionary.reference.com/search?q=oblige
"To do a service or favor:
The soloist obliged with yet another encore. "
is correct.
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I'm not quite as sure about MO though.