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Let \( \mathrm{B} \) be a subset of \( \mathrm{A} \) and
let \( \mathrm{P}(\mathrm{A}: \mathrm{B})=\{\mathrm{X} \in \mathrm{P}(\mathrm{A}): \mathrm{X} \geq \mathrm{B}\} \)
Let \( \mathrm{B}=\{a, b\} \) and \( \mathrm{A}=\{a, b, c . d\} \). List all the members of the set \( \mathrm{P}(\mathrm{A}: \mathrm{B}) \).
\( \mathrm{W} \)
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