Suppose that each of two prisoners has the independent choice of confessing to a crime or not confessing. Note that they cannot communicate with each other. If neither confesses, they spend 4 years in jail; if both confess, they spend 6 years in jail; and if one confesses while the other does not, the confessor gets off with 2 years in jail while the other gets 10 years in jail. According to game theory, the likely strategy by the prisoners is:____________.