. . . . . "3.56504E-1"^^ . "4.0E1"^^ . "1.33779E-1"^^ . "5.78314E-2"^^ . "https://data.cooperationdatabank.org/vocab/prop/symmetric" . "James A. Schellenberg" . "1964-06-01:00"^^ . . . "5.0E-1"^^ . "60"^^ . "60"^^ . "3.27E-1"^^ . . . . . "2"^^ . "4.0E-1"^^ . . "2"^^ . . "1965"^^ . "Published Article" . "Prisoner's Dilemma Game" . "Lab" . "Hypothetical" . "Partner" . "Repeated" . . "2020-12-17T00:21:28.774Z"^^ . . . . "2020-12-01T00:00:00.000Z"^^ . .