Дан куб ABCDA1B1C1D1. Можно ли провести плоскость через прямые: 1) AB и BD1; 2) BB1 и DD1; 3) AA1 и BD1; 4) A1D и B1C 5) AD и B1C. Проходит ли плоскость BDD1 через точку B1?
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