|Fun:|| (2) |
|Difficulty:|| (2.34) |
We all know and love those drawing puzzles in which you have to draw a symbol without retracing or lifting your pencil. The quickest way to check if a symbol can be drawn with such restrictions is to count the vertices in which an odd number of line segments meet.
If there are more than three vertices in which this occurs, the symbol cannot be drawn.
Can a symbol have only one vertex in which this occurs?
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