Construct a group table for a group of order $4$ which has exactly one element $x$ satisfying $x^2=e$, where $e$ is the identity element. NOTE: Denote the elements of your group by $\lbrace e, x, y, z \rbrace$ IN THIS ORDER, where $x$ is the aforementioned element.

	$e$	$x$	$y$	$z$
$e$
$x$
$y$
$z$