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U=(1,2,3,4,5,6,7,8,9,10) A=(1,2,5) B=(6,7)
A intersection B'
B'=(1,2,3,4,5,8,9,10)
A intersection B'=(1,2,5)
A intersection B'
B'=(1,2,3,4,5,8,9,10)
A intersection B'=(1,2,5)
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