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الإتاحة: https://doi.org/10.1002/evan.21909Test
https://napier-repository.worktribe.com/file/2773095/1/Cooperation%20In%20Large-scale%20Human%20Societies%20%E2%80%93%20What,%20If%20Anything,%20Makes%20It%20Unique,%20And%20How%20Did%20It%20Evolve%3FTest
http://researchrepository.napier.ac.uk/Output/2773095Test -
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