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**Product of Sums (POS)**equation with the following

**Karnaugh Map.**Just need someone to check my work please. I am questioning my self on my grouping. Did I group correctly or should I have grouped the bottom left 0 and D versus the 0 in the group of 8? Thanks for your time.

My Answer: \(\displaystyle (\bar{z})(\bar{y} + w + \bar{x})\)