Fix typos

Misc/Warm-Ups/furniture.tex

@@ -39,7 +39,7 @@
 		\item Rosewood
 	\end{itemize}
 
-	The following contitions govern Irene's purchases:
+	The following conditions govern Irene's purchases:
 	\begin{itemize}
 		\item Any vanity she buys is Maple.
 		\item Any rosewood item she buys is a sideboard.
@@ -135,7 +135,7 @@
 	\problem{}
 	Suppose the condition that Irene does not buy an oak table is
 	replaced with the condition that she does not buy a pine table.
-	If all the other contitions hold as originally given, which of the
+	If all the other conditions hold as originally given, which of the
 	following cannot be true?
 	\begin{itemize}
 		\item Irene buys an oak footstool.

Misc/Warm-Ups/mario.tex

@@ -40,7 +40,11 @@
 		A 11-way tie is possible, with a top score of 28:
 		\begin{itemize}
 			\item Four players finish $1^\text{st}$, $3^\text{ed}$, $11^\text{th}$, and $12^\text{th}$;
+
+			% spell:off
 			\item Four players finish $2^\text{nd}$, $4^\text{th}$, $9^\text{th}$, and $10^\text{th}$;
+			% spell:on
+
 			\item Two players finish fifth twice and seventh twice,
 			\item One player finishes sixth in each race.
 		\end{itemize}

Misc/Warm-Ups/regex.tex

@@ -71,7 +71,9 @@
 	They specify exactly how many tokens to match: \par
 	\htexttt{ab\{2\}a} will match only \texttt{abba}. \par
 	\htexttt{ab\{1,3\}a} will match only \texttt{aba}, \texttt{abba}, and \texttt{abbba}. \par
+	% spell:off
 	\htexttt{ab\{2,\}a} will match any \texttt{ab...ba} with at least two \texttt{b}s.
+	% spell:on
 
 	\vspace{5mm}