Tit-for-TatA strategy for the iterated Prisoner's Dilemma in which a prisoner cooperates on the first move, and thereaftercopies the previous move of the other prisoner. Any better strategy has more complicated rules. See also Prisoner's Dilemma
References
Goetz, P. ``Phil's Good Enough Complexity Dictionary.'' http://www.cs.buffalo.edu/~goetz/dict.html.
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