$4.(7$ points$)$ Let X be the set $\{1,2,3,4,5\}$ and Y be the set $\{6,7,8,9,10\}.$ The unary function g : X $7->$ Y and

the binary function f : X $\backslash$times Y $7->$ Y are described in the following tables.

n g$($n$)$

$16$

$27$

$38$

$48$

$59$

f $678910$

$11010101010$

$2789106$

$377889$

$4987610$

$566666$

Co$-$domain