Actually, perhaps I never even specified what you are to make them out of - you might be the weapons specialist and obviously much better suited than I to decide what the appropriate materials are, so I might have just told you to make blowguns and omitted what to use because I don't know. Lojban allows for such ambiguities, the key is that there is a rigid logical structure within which these ambiguities exist, so the speaker and listener should both be aware of exactly what the speaker is being ambiguous about and the listener can ask for clarification on any of those pieces of information if they so choose.