Fill in the blanks to make each of the following a true statement :
$\varnothing^ {\prime}\cap A$
Fill in the blanks to make each of the following a true statement :
$\varnothing^ {\prime}\cap A$
$\varnothing^{\prime} \cap A=U \cap A=A$
$\therefore \varnothing^{\prime} \cap A=A$
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