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diff --git a/620/CH27/EX27.4/example27_4.sce b/620/CH27/EX27.4/example27_4.sce
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+fr=400;
+f=12;
+f1=fr-f/2;
+f2=fr+f/2;
+disp("the edge frequencies (in kHz) are"); disp(f1); disp("and"); disp(f2); \ No newline at end of file