Step 1: Represent the given Boolean expression in a Karnaugh map:
\[
\begin{array}{|c|c|c|c|c|}
\hline
& CD & \overline{CD} & \overline{CD} & \overline{CD} \\
\hline
AB & 1 & 1 & 1 & 1 \\
\hline
A\overline{B} & 1 & 1 & 1 & 1 \\
\hline
\overline{A}B & 1 & 1 & 1 &
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