the CIDR $($classless$)$ address block: $200\mathrm{.}107\mathrm{.}16\mathrm{.}17/18.$b$.$ Combine the following blocks of IP addresses into a single block: $16\mathrm{.}27\mathrm{.}24\mathrm{.}0/26,16\mathrm{.}27\mathrm{.}24\mathrm{.}64/26,16\mathrm{.}27\mathrm{.}24\mathrm{.}128/25.$