A step-to-step and "easy to understand" explanation please, I'll upvote.

Using a K-map, simplify the following sum of products into a product of sums. f=ABCD+ABCD+ABCD+ABCD+ABCD Note that the following lists "don't care" terms: ABCD,ABCD, and ABCD F=(A+B)(C+D)(B+C+D)F=(A+B)(C+D)(B+C+D)F=(A+B)(C+D)(B+D)F=(A+B)(C+D)(B+D)