$3\mathrm{.}20$ Draw the multi$-$level NOR and multi$-$level NAND circuits for the following expression:

$(A{B}^{\text{'}}+C{D}^{\text{'}})E+BC(A+B)$

$3\mathrm{.}21$ Draw the multi$-$level NAND circuit for the following expression:

$w(x+y+z)+xyz$