--- /dev/null
+ S1 S2 S3 S4 S5
+-------------------------------------------
+S1 - t t o t
+-------------------------------------------
+S2 - - t,o t,a a
+-------------------------------------------
+S3 - - - t,a /
+-------------------------------------------
+S4 - - - - t,a
+-------------------------------------------
+
+t: true dependence
+a: anti dependence
+o: output dependence
+