Use a Karnaugh map to minimize this Boolean expression.

$z(wxy+w\frac{x}{b}ar(y))+\frac{y\frac{+}{b}ar(z)}{b}ar(w)x\frac{+}{b}ar(w)\stackrel{}{x}y\frac{+}{b}ar(w)\frac{x}{b}ar(y)z$