The PairwisePosition
function identifies if two situations are in
the same position given that they are in the same stage.
PairwisePosition(pair.situation, num.category, pos.next.level)
(vector) - situations to be analysed
(numeric) - number of edges that unfolds from the situations
(vector) - It identifies the positions corresponding to all situations that are children of situations associated with the variable spanning our target stage.
boolean