Points $\mathrm{A},\mathrm{}\mathrm{B}$ and $\mathrm{C}$ are collinear. Can you draw another line passing through $\mathrm{A},\mathrm{}\mathrm{B}$ and $\mathrm{C}$?

The points $\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S}$ are collinear. If points $\mathrm{S}, \mathrm{T}, \mathrm{A}, \mathrm{B}$ are collinear, then will the points $\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S}, \mathrm{T}, \mathrm{A}$, $\mathrm{B}$ always be collinear? Explain your answer with the help of a diagram.