For the set $\{A\}$, the subsets are $\{\}$ and $\{A\}$.
For the set $\{A, B\}$, the subsets are $\{\}$, $\{A\}$, $\{B\}$, and $\{A, B\}$.
For the set $\{A, B, C\}$, the subsets are $\{\}$, $\{A\}$, $\{B\}$, $\{C\}$, $\{A, B\}$, $\{A, C\}$, $\{B, C\}$, and
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