A= { x ∈ Z | -4 < x ≤ 2} ==> A={-4,-3,-2,-1,0,1,2}
B= { x ∈ N | x ≤ 3 } ==> B={0,1,2,3}
C= { x ∈ Z | -2 < x < 5 } ==> C={-1,0,1,2,3,4}
D= { X ∈ Z | 3 ≤ X ≤ 8 } ==> D={3,4,5,6,7,8}

Determine:
a) A U B
b) A Π B
c) A U D
d) A Π D
e) A U B U D
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