\item \points{3}$\lnot \lnot x \imp \lnot y \land z \ent z \imp \lnot x \land \lnot \lnot y$
\item \points{3}
$\lnot \lnot x \imp \lnot y \land z \ent z \imp \lnot x \land \lnot \lnot y$
