In this short scene, we learn that the two of them have agreed to a one-month rule of living together. The first rule is that each of them will have a partner for the duration of the month. In other words, each of the two will have his or her own partner for 30 days. The second rule, however, is that they will have no partner at all for the entire month. This is because, as the narrator points out, each partner will have their own set of rules. The narrator then goes on to explain that each time he or she has a problem with the other's partner, she or he will have to explain the problem to him or her. In this way, each time they have a problem, they will be able to find a solution to the problem.