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diff --git a/sample/unary_numbers/FibSZ_9.in b/sample/unary_numbers/FibSZ_9.in
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+++ b/sample/unary_numbers/FibSZ_9.in
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+// Fibonacci number on unary natural numbers
+fib(r)><Z => r~Z;
+fib(r)><S(x) => fibS(r)~x;
+fibS(r)><Z => r~S(Z);
+fibS(r)><S(x) => Dup(x1,x2)~x, add(r,r2)~r1, fib(r2)~x2, fibS(r1)~x1;
+
+
+
+//------ ADD ------
+//Add para
+add(r,x)><Z => r~x;
+add(r,x)><S(y) => r~S(w), add(w,x)~y;
+
+//Add_Seq
+//add(r,y)><Z => y~r;
+//add(r,y)><S(x) => add(r, S(y))~x;
+
+
+// ------ DUP ------
+// Dup is defined as built-in:
+//
+// Dup(x1,x2)><Z => x1~Z, x2~Z;
+// Dup(x1,x2)><S(x) => x1~S(w1), x2~S(w2), Dup(w1,w2)~x;
+
+
+
+
+// Execution
+// Fib 9
+fib(r)~S(S(S(S(S(S(S(S(S(Z)))))))));
+prnat r;
+free r;
+