The prescriptions of the leading eight.

The top row (X,Y) indicates the reputations of the donor and the recipient, respectively. For instance, (G,B) refers to the case of a good (G) donor who meets a bad (B) recipient. The rules S, R(C), R(D) indicate the prescribed action, the assessment when cooperation (C) is observed, and the assessment when defection (D) is observed, respectively. An entry of 1 means the donor is assessed as good and 0 means the donor is assessed as bad. Those columns in which the leading eight differ from each other are highlighted in bold text.