For what values of $\text{'}\text{'}$ a will the following system of linear equations $($i$)$ have no solution? $($ii$)$ a unique solution? $($iii$)$ infinitely many solutions?

x$-3$z$=-3$ ax$+$y$+$z$=1$

$2$x$+$y$-$z$=-2$ x$+$ay$+$z$=1$

x$+2$y$+$az$=1$ x$+$y$+$az$=1$