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抜け ぬけ
omission; slip; error; fault
ふふ ふふ
ha ha ha; hee hee hee
はふはふ はふはふ
alternately sucking in and blowing out air through one's mouth while eating something hot (in order to cool it down)
ふがふが ふがふが
breathily (while talking)
ふにふに ふにふに
stroke; caress