$2-13.$ Take each four$-$bit binary number in the order they are written and write the equivalent hex digit without performing a calculation by hand or by calculator.

$($a$)1001$

$($e$)1111$

$($i$)1011$

$($m$)0001$

$($b$)1101$

$($f$)0010$

$($j$)1100$

$($n$)0101$

$($c$)1000$

$($g$)1010$

$($k$)0011$

$($o$)0111$

$($d$)0000$

$($h$)1001$

$($l$)0100$

$($p$)0110$