 
 <prompt> If only one actor wey don sign into one treaty take action, how e take act? Given di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Treaties no dey always bind permanently on top di parties wey sign am. As obligations for international law dey usually dey see as e dey come out from di agreement of states, many treaties dey expressly allow one state to waka comot as long as e follow certain procedures of notification. For example, di Single Convention on Narcotic Drugs talk say di treaty go end if, as people dey waka comot, di number of parties wey dey involved fall below 40. Many treaties dey expressly forbid waka comot. Article 56 of di Vienna Convention on top di Law of Treaties talk say if one treaty no talk whether e fit be denounced or not, e dey presume say e no fit be unilaterally denounced unless: 