For some reason, Zhang and Li are now faced with the choice of two plans A and B  If both of them choose plan A, Zhang gets five unit benefits and Li gets two unit benefits  If Zhang chooses plan A and Li chooses plan B, both Zhang and Li get four unit benefits  If Zhang chooses plan B and Li chooses plan A, Zhang gets six unit benefits and Li gets one unit benefit; if both Zhang and Li choose plan B, they each get three unit benefits
Assuming that both Zhang and Li calculate and act according to the standard of maximizing their own interests, they both understand the gains and losses of the above interests, and their choices are in no particular order
Zhang chooses plan B, and Li chooses plan A