Thread: Can this circuit be simplified?

I forgot to mention, only not and nand gates can be used for this problem.
TT
x y z output
0 0 0 1
0 0 1 1
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 1
1 1 0 1
1 1 1 1