\[Подмножества \Longrightarrow \left\{ 5 \right\},\left\{ 6 \right\},\left\{ 7 \right\},\]
\[\left\{ 5,\ 6 \right\},\left\{ 5,\ 7 \right\},\left\{ 6,\ 7 \right\},\left\{ 5,\ 6,\ 7 \right\},\left\{ \varnothing \right\}.\]