Comme un jeu

There are three students: X, Y, and Z. A teacher selects one student each day, on Monday and Tuesday, to recite a poem. The selection is made without replacement, meaning the same student cannot be chosen both days. The table below shows the possible selections for the two days.

$\begin{aligned} Tuesday \\ Monday \end{aligned}$	$X$	$Y$	$Z$
$X$	X	$X Y$	$X Z$
$Y$	$Y X$	X	$Y Z$
$Z$	$Z X$	$Z Y$	X

Count the number of possible outcomes.

possible outcomes.