Prove that \( \mathrm{A} \subseteq \mathrm{B}, \mathrm{B} \subseteq \mathrm{C} \) and \( \mathrm...

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Prove that \( \mathrm{A} \subseteq \mathrm{B}, \mathrm{B} \subseteq \mathrm{C} \) and \( \mathrm{C} \subseteq \mathrm{A} \Rightarrow \mathrm{A}=\mathrm{C} \).
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