A large number of consecutive IP addresses are available starting at $54\mathrm{.}128\mathrm{.}128\mathrm{.}0.$ Suppose that five organizations, A$,$ B$,$ C$,$ D and E$,$ request $1000,3000,500,16000$ and $8000$ addresses, respectively, and in that order. For each of these, give the first IP address assigned, the last IP address assigned, and the mask in the w$.$x$.$y$.$z$/$s notation.