...
and as for what MikeML said "If you had a map with only a single zero, a 4 input NAND gate would implement the function."
That is only true for 1111 would give a low and the rest high...
Okay I see where I went wrong was on the truth table as well as the k-map. Sho I have a lot of practicing to do I really thought I had the truth table correct.
