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+        //    PG (621)
+
+//    For the previous example, consider the sequence f0, f1....f6
+
+//    For lam = 3,
+
+//        (f0,.....f6) = (1,-1,0,1,-1,0,1)
+
+//    The corresponding sequence of signs is 
+
+//        (+,-,+,+,-,+,+)
+
+//    and s(3) = 2
+\ No newline at end of file