On the left side, I have listed partial IPv$4$ addresses. Only the network portion of these IP addresses is shown in decimal. The rest of the IPv$4$ address is the host portion, which is indicated by Xs$.$ Match the subnet mask that had to have been assigned to these addresses that would cause the network portion to be what it is$.($These IPv$4$ addresses may or may not have been assigned their default subnet mask.$)$ The subnet masks on the right will be used more than once.

$13\mathrm{.}75\mathrm{.}12.$X

$33\mathrm{.}99.x.x$

$172\mathrm{.}22\mathrm{.}7.$X

$44.$X$.$X$.$X

$193\mathrm{.}220\mathrm{.}8.$X

$126\mathrm{.}126.$X$.$X

$2.$X$.$X$.$X