\[Подмножества \Longrightarrow \left\{ 1 \right\},\ \left\{ 2 \right\},\ \left\{ 3 \right\},\ \]
\[\left\{ 1;2 \right\},\ \left\{ 1;3 \right\},\ \left\{ 2;3 \right\},\ \left\{ 1;2;3 \right\},\ \left\{ \varnothing \right\}.\]