$4-$bit sequence dcba is treated as a binary NBC value, for example $0000(d=0,c=0,b=0,a=0)$ is decimal $0.$ Please implement the

function z giving $1$ for the following decimal values: $13,5.$

Implement this function using the demultiplexer. The variable a is msb$.$ Provide the indices of the $"$y$"$ lines directed to the inputs

of the OR gate. Separate the indices by point, for example, $0000\mathrm{.}1111$