<span style="color:#ff0000;">a. <span style="color:#ff0000;">If they don't have either Form A or Form B, then they're in trouble.</span><br/><br/> b. If they don't have either of them, then they're in trouble.</span><br/><br/> Can't these sentences mean two things:<br/> 1. They need at least one of the two things.<br/> 2. They need both of them.<br/><br/><br/><br/> Many thanks.