Andy: He can't be the youngest. He must be the oldest.
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Joy: He must be a teacher.
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Joy: He must be reading.
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Joy: She must be Danish.
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Andy: He can't be a teacher. He must be a student.
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Andy: She can't be forty. She must be fifty.
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Joy: He must be ill.
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Andy: He can't be reading. He must be sleeping.
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Andy: She can't be Danish. She must be Swedish.
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Joy: She must be forty.
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Joy: He must be a dentist.
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Joy: It must be the 20th.
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Andy: It can't be the 20th. It must be the 21th.
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Andy: He can't be ill. He must be tired.
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Joy: He must be the youngest.
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Joy: It must be your new hat.
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Andy: He can't be a dentist. He must be a doctor.
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Andy: It can't be my new hat. It must be my old hat.
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