@lapo @ryanc Very reasonable for the what3words use case ... but may get tricky as the target keyspace gets larger. Short wordlist for something like passwords turns into 7 or more words to get enough keyspace. And the "humans can keep 5 to 9 things in short-term memory" means that rehearsal of 5 things to try to commit it from short-term to long-term keeps memorization manageable for a greater number of users.