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//chapter28
//example28.12
//page609

printf(" Y = A . B` . D + A . B` . D` \n")
printf(" Factor out A . B` by theorem 14 \n")
printf(" Y = A . B` ( D + D` ) \n")
printf(" But by theorem 3 D + D` = 1 \n")
printf(" Y = A . B` . 1 \n")
printf(" By theorem 2 \n")
printf(" Y = A . B` \n")