Uploaded example 20 from the manual

Example20_Activity_Diagram.mp

+/* Example20_Activity_Diagram.mp
+
+	This model demonstrates how to use "SHOW ACTIVITY DIAGRAM" to
+display the possible traces in flowchart form. Root A has 4 different
+possible traces at scope 1, and the flowchart displays those possiblities.
+
+*/
+
+SCHEMA Activity_Diagram
+
+ROOT A:
+	a1
+	[a2]
+	{ a3, a4, a5 }
+	a6
+	( a7 | a8 );
+
+SHOW ACTIVITY DIAGRAM A;
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