Write the simplified sum$-$of$-$products Boolean expression for the un$-$simplified expression

$A*B*C*D+A*B*C*D=Y.$ A four$-$variable Karnaugh map is provided for your use in Fig. $4-4.$

Write the simplified Boolean expression for the un$-$simplified expression

$\frac{?}{\text{b}\text{a}\text{r}}(A)\frac{*}{b}ar(B)*C*D\frac{+}{b}ar(A)*B*C*D+A\frac{*}{b}ar(B)\frac{*}{b}ar(C)*D+A\frac{*}{b}ar(B)\frac{*}{b}ar(C)\frac{*}{b}ar(D)=Y$

A four$-$variable Karnaugh map is provided for your use in Fig. $4-4.$