Cognate with Lao ສິບແປດ (sip pǣt), Lü ᦉᦲᧇᦶᦔᧆᧈ (ṡiibṗaed¹), Shan သိပ်းပႅတ်ႇ (síp pèt) and Thai สิบแปด (sìp-bpɛ̀ɛt).
cib bet (1957–1982 spelling cib bet)