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Rewrite the following using mathematical symbols:
a. Q is equal to the set whose elements are a, b, and c.
b. The set containing 1 and 3 only is a proper subset of the set of natural numbers.
c. The set containing 1 and 3 only is not a subset of {1,4,6,7}
d. The empty set does not contain 0 as an element.

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