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// chapter28
// example28.6
//page606
printf("Y = A . B . C` . D` + A` . B . C` . D` + A` . B . C . D` + A . B . C . D` \n")
printf("taking out the common factors \n")
printf("Y = B . C` . D` . ( A + A` ) + B . C . D` . ( A + A`) \n")
printf("By theorem 3 \n")
printf("Y = B . C` . D` + B . C . D` \n")
printf("again factorize \n")
printf("Y = B . D` ( C + C` ) \n")
printf("By theorem 3 \n")
printf("Y = B . D` . 1 \n")
printf("thus \n")
printf("Y = B . D` \n")
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