Determine whether these statements are true or false
a) ∅ ∈ (∅)
b) ∅ ∈ {∅.(∅}}
c) {0} ∈ (∅)
d) {∅} ∈ {{∅}}
e) {0} ⊂ {∅.{∅}}
f) {{∅}} ⊂ {∅,{∅}}
g) {(∅}} ⊂ {{∅}. {∅}}
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