Let A = {1, {1}, {2}}. Which of the following statements are true?
a) 1 ∈ A
b) {1} ∈ A
c) {1} ⊆ A
d) {{1}} ⊆ A
e) {2}∈ A
f) {2}⊆ A
g) {{2}} ⊆ A
h){{2}} ⊂ A
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