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\begin{document}
\begin{center}
{\bf Solutions to Homework 4}
\end{center}

\input{solns/rudin/239-15.tex}
\input{solns/rudin/239-21.tex}
\input{solns/rudin/239-23.tex}
\input{solns/my/impfneg.tex}
\input{solns/my/impfn.tex}

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