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diff --git a/104/CH3/EX3.5/3_5.sce b/104/CH3/EX3.5/3_5.sce
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+//mason's gain formula applied to SFG in figure 3-16
+//y2 as output node
+syms G1 G2 G3 G4 G5 H1 H2 H3 H4
+M1=1
+L11=-G1*H1
+L21=-G3*H2
+L31=G1*G2*G3*-H3
+L41=-H4
+L12=G1*H1*G3*H2
+L22=G1*H1*H4
+L32=G3*H2*H4
+L42=-G1*G2*G3*H3*H4
+L13=-G1*H1*G3*H2*H4
+delta=1-(L11+L21+L31+L41)+(L12+L22+L32+L42)+L13
+delta1=1-(L21+L41)+(L32)
+x=M1*delta1/delta
+disp(x,"y2/y1=")
+//y4 as output node
+M1=G1*G2
+delta1=1-(L41)
+y=M1*delta1/delta
+disp(y,"y4/y1=")
+//y6 or y7 as output node
+M1=G1*G2*G3*G4
+M2=G1*G5
+delta1=1
+delta2=1-(L21)
+z=(M1*delta1+M2*delta2)/delta
+disp(z,"y6/y1=y7/y1=")
+\ No newline at end of file