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diff --git a/135/CH3/EX3.31/EX31.sce b/135/CH3/EX3.31/EX31.sce
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+// Example 3.31: Output voltage
+clc, clear
+t=[0:0.1:9*%pi];
+vin=15*squarewave(t)-5; // Input wave in volts
+vo=vin+25; // in volts
+plot2d(t,vo,rect=[0,0,9*%pi,40]);
+xtitle("Output voltage","t","vo");
+\ No newline at end of file