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ner's Dilemma, in which the payoff for defection is higher than for cooperation regardless of one's partner behavior, EFTA00810742 J. Wakeley and M. Nowak/Theoretical Population Biology 125(2019)38-55 39 Table 1 The payoff, a(n). J(n), c(n) or d(n). that an individual receives in a symmetric two-pla