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diff --git a/635/CH1/EX1.2/Ch01Ex2.sci b/635/CH1/EX1.2/Ch01Ex2.sci
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index 000000000..50be14759
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+++ b/635/CH1/EX1.2/Ch01Ex2.sci
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+// Scilab Code Ex1.2 Primitive unit cell: Page-4 (2010)
+a = 3, b = 3;     // Lattice translation vectors along X and Y direction, angstrom
+c_bar = 3;    // Assumed translation vector along Z direction, angstrom
+c = 1.5*(a+b+c_bar);    // Real translation vector along Z direction, angstrom
+printf("\n%3.1f is the body centered position of a cubic unit cell defined by the primitive translation vectors a, b and c_bar.", c);
+V_con = a^3;    // Volume of conventional unit cell, metre cube
+V_primitive = 1/2*V_con;    // Volume of primitive unit cell, metre cube
+printf("\nThe volume of conventional unit cell: %2d angstrom cube", V_con);
+printf("\nThe volume of primitive unit cell: %4.1f angstrom cube", V_primitive);
+
+// Result 
+// 13.5 is the body centered position of a cubic unit cell defined by the primitive translation vectors a, b and c_bar.
+// The volume of conventional unit cell: 27 angstrom cube
+// The volume of primitive unit cell: 13.5 angstrom cube 
+\ No newline at end of file