For each part, give a graph of a function that satisfies the description given.

$($a$)\underset{x2}{lim}f(x)=4,$ but $f(2)4.$

$($b$)f(2)=4,$ but $\underset{x2}{lim}f(x)4.$

$($c$)\underset{x1}{lim}f(x)=-,$ but $f(1)$ is defined.

$($d$)\underset{x}{lim}f(x)2$ and $\underset{x-}{lim}f(x)1.$