Indicate which symbol, ϵ or ϵ, makes each of the following statements true:
a. Ø ___Ø
b. {2} ____{3, 2, 1}
c. 1022 ____(s | s = 2n – 2, n Є N}
d. 3004 ____{x | x = 3n + 1, n Є N}
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