That could actually be an interesting linguistics problem. In spoken languages, "between" is usually inclusive unless context suggests otherwise. It can easily

That could actually be an interesting linguistics problem. In spoken languages, "between" is usually inclusive unless context suggests otherwise. It can easily be a source of misunderstanding if the context clues are insufficient or the recipient has trouble picking up on them. I wonder if there are any languages that have different words for inclusive/exclusive "between" so people don't have to rely on implicit clues.