POLYTONIC

in it li lo no oi on op oy pi ti to yo

col con coo cop cot coy icy ion lin lip lit loo lop lot nil nip nit noo not oil ono oot opt pic pin pit ply poi pol poo pot tic til tin tip ton too top toy yin yip yon

cion city clip clon clop clot cloy coil coin colt coly coni cony cool coon coop coot copy icon inly into lino lint liny lion loci loco loin loon loop loot loti noil nolo oily olio only onto otic pily pint piny pion pity plot ploy poco polo poly pony pool poon pyic pyin tiny toil tony tool toon topi topo toyo tyin typo yoni