rules/periodically_ddc.pl


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% Plays periodically: Defect–Defect–Coop.
%
% Syntax: periodically_ddc(+history, -choice, +state_in, -state_out)

periodically_ddc(_, d, [],  [1]).
periodically_ddc(_, d, [1], [2]).
periodically_ddc(_, c, [2], []).