\begin{alltt}
HW 4, Due Week 5
\BF{3.1}: 1, 6, 10, 27, 33, \bx{34}, \bx{36}, 37, \bx{38}, 39, \bx{40}, 41, \bx{42}, 43, \bx{46}, \bx{48}, 53
\BF{3.2}: 1, 2, 5, 8, 11,13, 16, \bx{18}, 19, 20, 21, \bx{22}, 23, 25, 26
\BF{3.3}: 3, 7, \bx{8}, 9, \bx{10}, 11, \bx{16}, 17, 23, 27, 31, \bx{32}, 37, 40
\BF{3.4}: 3, 4, 5, 6, 10, 11, 15, 17, 19, \bx{20}, 21, 33, \bx{34}
\end{alltt}