A statistician for a chain of department stores created the following stem-and-leaf plot showing the number of pairs of glasses at each of the stores: \left| \quad \begin{matrix} 0 \vphantom{\Large{0}} \\ 1 \vphantom{\Large{0}} \\ 2 \vphantom{\Large{0}} \\ 3 \vphantom{\Large{0}} \\ 4 \vphantom{\Large{0}} \\ \end{matrix} \quad \right| \quad \begin{matrix} 9& \vphantom{\Large{0}} \\ 3&6&6&8& \vphantom{\Large{0}} \\ 1&2&3&5&6&9& ; \vphantom{\Large{0}} \\ 0& \vphantom{\Large{0}} \\ 1&2&3&3&5&7& ; \vphantom{\Large{0}} \\ \end{matrix} ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ​ 00 10 20 30 40 ​ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ ​ 9 3 1 0 1 ​ 0 6 2 0 2 ​ 6 3 3 ​ 8 5 3 ​ 0 6 5 ​ 9 7 ​ 0 0 ​ Key: 4\,|\,1=414∣1=414, vertical bar, 1, equals, 41 pairs of glasses What was the largest number of pairs of glasses at any one department store?