Question 771249
a. {2, 4, 6, 8, 10} = {x / x is even 2<=x<=10}
b. {a, e, o, i, u}   = {x/ x is a vowel} 
c. {1, 4, 9, 16, 25, 36} = {x / x =n^2 , 1<=x<=6}
d. {-2, -1, 0, 1, 2} = {x / x in Z / -2<=x<=2}

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