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Oa is for oath.
Ob is for observation and object.
Oc is for occupy and ocean.
Od is for odd.
Of is for offer.
Oh is for ohio.
Oi is for oily.
Ol is for old boy, older and old testament.
Om is for omit.
On is for on it, one and once more.
Op is for opposing, operation and opera.
Or is for orderly, order and organic.
Os is for ossification.
Ot is for other.
Ou is for oust and outdistance.
Ov is for over and over.
Ow is for own.
Ox is for oxide.
Oy is for oyabun.
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wind_sock means truncated cloth cone used to indicate wind direction; ... more