Trisha's three young children frequently argue and fight. to reduce this problem behavior, trisha sets an appropriate time limit during play time, and if the children refrain from squabbling during that period, they are immediately given positive reinforcement. according to the in focus box, "changing the behavior of others," this strategy is called:

The fact that Trisha sets an appropriate time limit during play time, and if the children refrain from squabbling during that period, they are immediately given positive reinforcement means that Trisha is using the strategy called: reinforcing the nonoccurrence of the problem behavior.
This strategy is an effective method to eliminate behaviors that might be troublesome in the classroom. 

the two sets of lines are :

and remember beauty,five-wits,strength,and discretion ,they all at the last do everyman forsake (to leave forever ) for after death amends may no man make,for then mercy and pity doth him forsake.(to leave forever )