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A comment on US citizens will need a visa to visit Europe starting in 2021. Parent comment

Re:US citizens will need a visa to visit Europe starting in ... by sorokod on Saturday March 09, 2019 @10:19AM (#19346521)
Tit for tat is an effective strategy for Prisoner's dilemma :

https://en.wikipedia.org/wiki/Prisoner%27s_dilemma#The_itera...

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