A large organization with a large block address $(12\mathrm{.}44\mathrm{.}184\mathrm{.}0/21)$ is split into one medium$-$size company using the block address $(12\mathrm{.}44\mathrm{.}184\mathrm{.}0/22)$ and two small organizations. If the first small company uses the block $(12\mathrm{.}44\mathrm{.}188\mathrm{.}0/23),$ what is the remaining block that can be used by the second small company?Explain how the datagrams destined for the two small companies can be correctly routed to these companies if their address blocks still are part of the Originak company