What is the subnet mask for a network that has $14$ bits for the network portion and $10$ bits for the host portion? $255\mathrm{.}255\mathrm{.}192\mathrm{.}0255\mathrm{.}240\mathrm{.}0\mathrm{.}0255\mathrm{.}255\mathrm{.}252\mathrm{.}0255\mathrm{.}255\mathrm{.}0\mathrm{.}0$