Decide whether each statement is true or false. Justify your answer.
a. {daffodil, daisy, rose, carnation} ⊂ {f : f is a flower}
b. {daffodil, daisy, rose, carnation} ⊆ {f : f is a flower}
c. {x : x is a former president of the United States} ⊂ {x : x is a man}
d. Ø ⊆ {1, 2, 3}>
e. Ø ⊂ Ø
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