Convert all the five triangles into the arrows attaching a stick to any of its three sides. The resulting arrows must point in different directions. Eight possible directions are indicated on the Wind Rose in the upper right corner. No any two neighboring arrows must share the same direction among the four main (NEWS) directions (North, East, West and South). At the end the numbers of North, East, West and South directions must be equal (indicated by the vertical column in the upper left corner).
The Example of what possible arrows the fourth triangle in the row can be converted into is shown in the diagram in the lower right corner. The triangle can be converted to an arrow pointing either to the N, SW or SE directions.
To convert a triangle into an arrow, click one of its three sides.