My choice was from word tiles, and I knew what DL was looking for and entered it, but it felt strange without one of the pronouns we were taught. Edit If E is being used to indicate the intentive mood, I guess "letʻs" has to be assumed. I hope someone knowledgeable will chime in.
For what it is worth... The use of a 1st or 2nd person pronoun is not common in present company in ordinary speech, especially when using the the command form "let us." For example, we rarely say "let's both get coffee" or "let's all get coffee," unless the message is trying to convey some specific distinction (one vs. many vs. all). The pronoun is omitted but still understood. We normally just say "Let's get coffee." "Au" is quite common, but "'oe" is not, at least not in command form. For example "Hold the door, please" as opposed to "You hold the door, please." When the subject of a command is understood, it is usually omitted in English as well as Hawaiian.
When one says "let's", one is saying "us", as in "we" (kakou or kaua). So lne of the hawaiian "us's" should be used!?
Or is that just to specify "just you and I" vs. "all of us?" So much of this is "understood" by someone who grew up with the language, and difficult to learn by someone who wasn't!