Chapter 12.4, Problem 30E

To determine

A minimal sum of products expansion, given the $k-$ map.

	$yz$	$y\overline{z}$	$\overline{y}\overline{z}$	$\overline{y}z$
$wx$	$d$	$1$	$d$	$1$
$w\overline{x}$		$d$	$d$
$\overline{w}\overline{x}$		$d$	$1$
$\overline{w}x$		$1$	$d$