POLYPNOEIC

el en in li lo ne no oe oi on op oy pe pi ye yo

cel cep col con coo cop coy eon ice icy ion lei ley lie lin lip loo lop lye nil nip noo oil ole one ono ope pec pen pep pic pie pin pip ply poi pol poo pop pye yen yep yin yip yon

ceil cine cion clip clon clop cloy coil coin cole coly cone coni cony cool coon coop cope copy enol epic icon inly leno lice lien line lino liny lion lipe loci loco loin lone loon loop lope nice noel noil nolo nope oily oleo olio once only open pein peon pepo pice pile pily pine piny pion pipe pipy plie plop ploy poco pole polo poly pone pony pool poon poop pope pyic pyin yelp yipe yoni