13. The figure below $\qquad$ (fill in "can" or "cannot") be drawn in one stroke. If it can, the drawing should start from $\qquad$ point (if the first blank is filled with "cannot", then the second blank is not filled; if there are multiple points that meet the requirement for the second blank, all points must be written out).
【Analysis】In the one-stroke drawing problem, there are two odd points, $\mathrm{M}$ and $\mathrm{N}$, so it can be drawn in one stroke; starting from $\mathrm{M}$ or $\mathrm{N}$ is fine, and the second blank should be filled with $\mathrm{M}$ or $\mathrm{N}$.