Added Moscow Puzzles

Misc/Moscow Puzzles/problems/121.tex

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+\documentclass[../main.tex]{subfiles}
+
+\begin{document}
+
+	\problem{How Does the Prisoner Escape?}
+
+	This dungeon has $49$ cells. In $7$ cells ($A$ to $G$ in the diagram) there is a locked door (black bar). The keys are in cells $a$ to $g$ respectively. The other doors open only from one side, as shown. \\
+
+	\medskip
+
+	How does the prisoner in cell $O$ escape? He can pass through any door any number of times and need not unlock the doors in any special order. His aim is to get the key from cell $g$ and use it to escape through cell $G$
+
+	\begin{figure}[h]
+		\centering
+		\includegraphics[width=8cm]{121}
+	\end{figure}
+	\vfill
+
+	Here's an extra copy of the dungeon:
+	\begin{figure}[h]
+		\centering
+		\includegraphics[width=8cm]{121}
+	\end{figure}
+
+\end{document}