Determine whether each of the following sets is unifiable. If yes, obtain a most general unifier.

w $=\{$Q$($u$,$ v$,$ w$),$ Q$($x$,$ h$($x$,$ y$),$x$)\}$

w$=\{$Knows$($Mother$($y$),$ y$),$ Knows$($z$,$ z$)\}$

$[$