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diff --git a/52/CH2/EX2.17/Example2_17.sce b/52/CH2/EX2.17/Example2_17.sce
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+//Example 2.17
+//To draw the pole-zero plot
+clear;
+clc ;
+close ;
+z=%z
+H1Z=((z)*(z-1))/((z-0.25)*(z-0.5));
+xset('window',1);
+plzr(H1Z);
+\ No newline at end of file