Parasites are so disgusting (see also Cuckoo birds): http://qz.com/441583/lyme-disease-is-spreading-faster-than-ever-and-humans-are-partly-to-blame/ …
If you cooperate only with those who cooperate back (as with the greenbeard effect), you can be resistant to some types of parasitism.
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It's basically a way of hacking the prisoner's dilemma. Always cooperate with those with your signal, and go tit-for-tat with everyone else.
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Actually the winning program here cooperated with its own and defected on everyone else. Anyway, the strategy wins. https://en.wikipedia.org/wiki/Prisoner's_dilemma#Strategy_for_the_iterated_prisoner.27s_dilemma …
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