Determine which of the following statements are true and which are false.
a) Z+ ⊆ Q+
b) Z+ ⊆ Q
c) Q+ ⊆ R
d) R+ ⊆ Q
e) Q+ ∩ R+ = Q+
f) Z+ ∪ R+ = R+
g) R+ ∩ C = R+
h) C ∪ R = R
i) Q* ∩ Z = Z
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