Determine the inverse of each element of $U(9)$. For the entry $a \pmod{9}$ in the table below, if $a \pmod{9}$ belongs to $U(9)$ then enter an integer $1 \leq b < 9$ so that $b \pmod{9}$ is an inverse of $a \pmod{9}$; if $a \pmod{9}$ does not belong to $U(9)$ then enter $0$.

$a$	$1/a \pmod{9}$
1
2
4
5
7
8