crossing Points
fun crossingPoints(position: Euclidean2DPosition): ERROR CLASS: Symbol not found for Pair<it/unibo/alchemist/model/positions/Euclidean2DPosition, it/unibo/alchemist/model/positions/Euclidean2DPosition>
Provided the position of an agent that may want to cross this passage, this method returns a pair containing both crossingPointOnTail and crossingPointOnHead.