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あう， 会う， 逢う， 遭う， 遇う
1. to meet, to encounter, to see
2. to have an accident, to have a bad experience
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思いがけない， 思い掛けない， 思い掛け無い， おもいがけない
1. unexpected, contrary to expectations, by chance, casual
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に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
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とは
1. indicates word or phrase being defined
2. used for quoting (thoughts, speech, etc.)
3. with
4. (not) as much as, (not) so much as
5. the fact that, to think that, such a thing as
tbd