Question 11
A *tetromino* consists of four squares connected along their edges. There are five possible tetromino shapes, $\mathrm{I}$, $\mathrm{O}$, $\mathrm{L}$, $\mathrm{T}$, and $\mathrm{S}$, shown below, which can be rotated or flipped over. Three tetrominoes are used to completely cover a $3 \times 4$ rectangle. At least one of the tiles is an $\mathrm{S}$ tile. What are the other two tiles?
