how are the relations among the four lovers straightned out

"Oberon told Puck to put love-in-idleness on Demetrius, instead he put it on Lysander by mistake, then he puts it on Demetrius; both men see Helena on first awaking and scorn Hermia. Oberon tells Puck to put them to sleep when they go to fight a duel and put something on Lysander's eyes to break the charm."