Your mission is to write a keyword suggestion system (as you may have seen on a search engine page as you type your query). You're only writing the server-side component whose input is a (partial) query and outputs suggestions. You must: * Make SuggestTest pass. * Explain your implementation of Suggestor: algorithms, pros/cons of your choices. * Hypothesize how to your solution would work "in the real world" with real traffic.