Exercise $6\mathrm{.}45$ Sometimes two words $($or variations of a word$)$ are mapped to the same response. Deal with this by mapping synonyms or related expressions to the same string, so that you do not need multiple entries in the response map for the same response.

Exercise $6\mathrm{.}46$ Identify multiple matching words in the user's input, and respond with a more appropriate answer in that case.