Xcos examples from textbooks and for blocksHEADmaster

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diff --git a/Working_Examples/83/CH6/EX6.4/example_6_4.sce b/Working_Examples/83/CH6/EX6.4/example_6_4.sce
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index 0000000..49b5188
--- /dev/null
+++ b/Working_Examples/83/CH6/EX6.4/example_6_4.sce
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+//Chapter 6
+//Example 6.4
+//page 209
+//To find bus voltages using GS iterations
+clear;clc;
+
+//Ybus matrix from the network
+Ybus=[3-9*%i -2+6*%i -1+3*%i 0;
+      -2+6*%i 3.666-11*%i -0.666+2*%i -1+3*%i
+      -1+3*%i -0.666+2*%i 3.666-11*%i -2+6*%i
+      0 -1+3*%i -2+6*%i 3-9*%i]
+
+//////////////////////////////////////////////////////
+//Pi       Qi       Vi         Remarks        Bus no//
+P1=0;     Q1=0;    V1=1.04;    //Slack bus    1
+P2=0.5;   Q2=-0.2; V2=1;       //PQbus        2
+P3=-1.0;  Q3=0.5;  V3=1;       //PQbus        3
+P4=0.3;   Q4=-0.1; V4=1;       //PQbus        4
+/////////////////////////////////////////////////////
+
+n=1;
+for i=1:n
+    V2=(1/Ybus(2,2))*(((P2-%i*Q2)/conj(V2))-Ybus(2,1)*V1-Ybus(2,3)*V3-Ybus(2,4)*V4);
+    V3=(1/Ybus(3,3))*(((P3-%i*Q3)/conj(V3))-Ybus(3,1)*V1-Ybus(3,2)*V2-Ybus(3,4)*V4);
+    V4=(1/Ybus(4,4))*(((P4-%i*Q4)/conj(V4))-Ybus(4,1)*V1-Ybus(4,2)*V2-Ybus(4,3)*V3);
+end
+
+printf('\nAt the end of iteration %d the voltages at the buses are:\n\nV1=',n);disp(V1);printf('pu');
+printf('\n\n\nV2=');disp(V2);printf('pu');
+printf('\n\n\nV3=');disp(V3);printf('pu');
+printf('\n\n\nV4=');disp(V4);printf('pu');
diff --git a/Working_Examples/83/CH6/EX6.4/result_example_6_4.txt b/Working_Examples/83/CH6/EX6.4/result_example_6_4.txt
new file mode 100755
index 0000000..4198a53
--- /dev/null
+++ b/Working_Examples/83/CH6/EX6.4/result_example_6_4.txt
@@ -0,0 +1,21 @@
+ 
+At the end of iteration 1 the voltages at the buses are:
+
+V1= 
+    1.04  
+pu
+
+
+V2= 
+    1.0190887 + 0.0463655i  
+pu
+
+
+V3= 
+    1.0280236 - 0.0870264i  
+pu
+
+
+V4= 
+    1.0250453 - 0.0092291i  
+pu