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-rw-r--r--rules/periodically_ssz.pl3
1 files changed, 3 insertions, 0 deletions
diff --git a/rules/periodically_ssz.pl b/rules/periodically_ssz.pl
index 21cb017..bfcb8d7 100644
--- a/rules/periodically_ssz.pl
+++ b/rules/periodically_ssz.pl
@@ -1,4 +1,7 @@
% Plays periodically: Coop-Coop-Defect
+
+% Syntax: periodically_ssz(+history, -choice, +state_in, -state_out)
+
periodically_ssz(_, c, [], [1]).
periodically_ssz(_, c, [1], [2]).
periodically_ssz(_, d, [2], []).