Mr. Watanabe had taken turns waiting in line for 37 hours with his 20-year-old friend, Kento Inoue.

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The prototype ran smooth, and turns could be taken in just a few seconds with selection and taps.

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But it turns out they may be brother and sister: in wartime, her mother had taken in (and taken up with) his father, a Jewish refugee and musician, while for self-protection conducting an affair with a Nazi.

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