Use the tail of the tail was removed per the arrow instead of a force that has 2 arrows representing the strongest 1.
Then remove the arrow tail instead of the force 3 arrowheads representing transit workers who ran out 2 to continue .....
By the arrow direction instead of the original voltage does not change.
The size returned is the length of the arrow, and then drag it from the beginning to the end.
With direction from the beginning to the end