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+//chapter28
+//example28.8
+//page607
+
+printf("i) Y = A + A` . B \n")
+printf(" By theorem 16 \n")
+printf(" Y = A + A . B + A` . B \n")
+printf(" = A + B ( A + A`) \n")
+printf(" By theorem 3 \n")
+printf(" Y = A + B \n \n")
+
+printf("ii) Y = A . B + A` . C + B . C \n")
+printf(" = A . B + A` . C + B . C ( A + A` )\n")
+printf(" = A . B + A` . C + A . B . C + A` . B . C \n")
+printf(" = A . B ( 1 + C ) + A` . C( 1 + B ) \n")
+printf(" = A . B + A` . C \n")