A zookeeper published the following stem-and-leaf plot showing the number of lizards at each major zoo in the country: $ \left| \quad \begin{matrix} 0 \vphantom{\Large{0}} \\ 1 \vphantom{\Large{0}} \\ 2 \vphantom{\Large{0}} \\ 3 \vphantom{\Large{0}} \\ 4 \vphantom{\Large{0}} \\ 5 \vphantom{\Large{0}} \\ 6 \vphantom{\Large{0}} \\ \end{matrix} \quad \right| \quad \begin{matrix} \vphantom{\Large{0}} \\ \vphantom{\Large{0}} \\ 0&6&8&8&8& \vphantom{\Large{0}} \\ 0&2&6&6&7&8& \vphantom{\Large{0}} \\ 1&2&6&6& \vphantom{\Large{0}} \\ \vphantom{\Large{0}} \\ \vphantom{\Large{0}} \\ \end{matrix} $ ** How many zoos have exactly $42$ lizards? ** [[☃ numeric-input 1]] zoos