That could actually be an interesting linguistics problem. In spoken languages, &quot;between&quot; 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&#x2F;exclusive &quot;between&quot; so people don&#x27;t have to rely on implicit clues.