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一つ一つ / ひとつひとつ : adv adj-no 1）one-by-one 2）separately 3）in detail P
一つづつ / ひとつづつ : adv adj-no 1）one by one 2）one each 3）one at a time
一つ宛 / ひとつずつ / ひとつづつ : adv adj-no 1）one by one 2）one each 3）one at a time
一つずつ / ひとつずつ : adv adj-no 1）one by one 2）one each 3）one at a time
一つ宛 / ひとつずつ / ひとつづつ : adv adj-no 1）one by one 2）one each 3）one at a time
一つ事 / ひとつこと : n 1）the same thing
一捻り / ひとひねり : n vs 1）a reworking 2）a pushover
一つ度も / ひとつども : conj 1）(with negative predicate) not even once, never
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ひとつひとつ

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