Add perverse examples

diff --git a/examples/perverse.dyna b/examples/perverse.dyna
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+%%% Free rules
+% f(1) := log(3)*2.
+% f(&g(2)) := 1.
+
+%%% Side conditions
+h(X) := 1 whenever X is f(1).
+%%% Side conditions and unifications
+% h(X) := 1 whenever X is f(1), X is f(2).
+
+%%% Binops
+% goal :- a & b.