  Since players will be both sender and receiver, they must have a strategy for each situation. There are sixteen such strategies, and we suppose them to be either inherited (or learned) from biological parents, or imitated on the basis of perceived success in terms of points earned. Strategies \(I_1\) and \(I_2\) are signaling systems, in that if both players play the same one of these two strategies they will always get their payoff. \(I_3\) and \(I_4\) are anti-signaling strategies, which result in consistent miscoordination, though they do well against each other. All of the other strategies involve \(S_3, S_4, R_3\), or \(R_4\), which results in the same act being performed no matter what the external state is.