\documentclass{pset}
\psnum{3}
\psdue{Monday, July 15}
\begin{document}
\maketitle
\standardadvice
\begin{problem}[10 points]
Problem 6.8 from the text.
\end{problem}
\begin{problem}[10 points]
Problem 4.4 from the text.
\end{problem}
\begin{problem}[15 points]
A \emph{Matryoshka box} is a set of rectangular boxes that are nested with
their faces aligned parallel. Rigorously, a Matryoshka box of cardinality $k$
is a set of boxes $b_1, \ldots, b_k$ where $b_i$ contains $b_j$ for all $i