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ổn + 
good, fine 
ôn ☊ ồn ☊ ổn ☊ ơn ☊ ớn ☊ like: ộn
to review (a lesson) ☊ ôn ☊ favor ☊ ơn ☊ noisy, uproarious ☊ ồn ☊ settled, smooth, without a hitch, stable, peaceful ☊ ổn ☊ accumulate ☊ ộn ☊ to be fed up; to have the shivers ☊ ớn ☊