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-rw-r--r--periodically_ddc.pl4
-rw-r--r--periodically_ssz.pl4
2 files changed, 8 insertions, 0 deletions
diff --git a/periodically_ddc.pl b/periodically_ddc.pl
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+++ b/periodically_ddc.pl
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+% Plays periodically: Defect–Defect–Coop.
+periodically_ddc(_, d, [], [1]).
+periodically_ddc(_, d, [1], [2]).
+periodically_ddc(_, c, [2], []).
diff --git a/periodically_ssz.pl b/periodically_ssz.pl
new file mode 100644
index 0000000..21cb017
--- /dev/null
+++ b/periodically_ssz.pl
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+% Plays periodically: Coop-Coop-Defect
+periodically_ssz(_, c, [], [1]).
+periodically_ssz(_, c, [1], [2]).
+periodically_ssz(_, d, [2], []).