根据所给例子，完成下列各题。
例: Sarah is 15 years old. Amy is 14 years old.
Sarah is one year older than Amy.
Amy is one year younger than Sarah.
1. John is 159 cm tall. Mike is 162 cm tall.
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2. Liu Yun is 12 years old. Chen Jie is 14 years old.
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3. Lucy is 42 kg and Mary is 43 kg.
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4. I am 40 kg and my brother is 38 kg.
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