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three
three years of age
おにぎりを3つ買っかった。
I bought three rice balls.
答えこたえは3つに絞らしぼられた。
The answers were narrowed down to three.
理由りゆうを3つ挙げあげてから自分じぶんの意見いけんを述べのべてください。
Please state three reasons before giving your opinion.