d-rod ddddd dholl dhool dhoop dhrol dhuhr dhupu do-do do-ol dodol dodoo dodro dohol dohop dohul dollo dollu dolor dolph dolpo doodo dorud doull douro droll drood drool droop drop- dropo drouh droul droup duddo dudou dullu duplo duruh hhhhh hhour hlddr ho-ho ho-oh hoddu hodhr hodod hodur hohol hollo holo- holor holou holul hoold hoopl hoord hopl- hoppo hopup horod horol horro horru horup hould hourd hudud hudul hudur huhuh hullo huolu hurll hurup huuru l-pop loddo lodro lohho lohur lollo lolol looph loord loph- lopou lopud lorup lourd louro luddu lulul lupul lurup oddup oddur odolo odoul odour odudu oduro oh-oh ohour ollup ollur olord olour ooooh ooooo oopod ophur oploo opodo opoho oppol ordro orlop orodo orold orolu oruro oullo ouoro ourol phlpp phool phrop ploop plopp plopu ploud plouh plupp po-po podo- podol podor podul pollo pollu polod polop polur poopo poplr popop poppo popup poro- porro porur poulp prodd prohd proll prolo proor prop- propl propp propr proud pudor pudur pull- pullu puppo puro- purul rdllr rhod- rhodo ro-ro rodl rodor rohod rohru rollo rolph roodu roull rprop rullo u-pop udol udoll uh-oh uh-uh uhdoh uhhoh uhhuh uhuru ullur uloop ulpur ululu uluru up-do uphol upolo upolu urour uuuuu