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+//Determination of Possible Point Defect Types
+
+clear;
+clc;
+
+printf("\tExample 12.5\n");
+
+disp("Replacement of Na+ by a Ca++ ion introduces one extra positive charge");
+
+disp("Removal of a positive charge is accomplished by the formation of one Na+ vacancy");
+
+disp("Alternatively, a Cl- interstitial will supply an additional negative charge, negating the effect of each Ca++ ion.");
+
+disp("The formation of this defect is highly unlikely.");
+
+//End
+\ No newline at end of file