bbbb bblb bibb bibi bibl bibo bili bill bilo bilu bio- bioi biol biou bipp bipu blio blip blob bloo blop blou blub blup bobb bobi bobo bobu boi- boii boil boiu boli boll bolo bolu boob bool boop bopp boul boup bubb bubi bubo bubu buiu bulb buli bull bulu buol iiii iiio iioi iioo iiop ilio ill- illi illo illp iloo iobi ioii ioio iolo iooi iooo iopl ipil iplo ipop ippo iuiu iupp libo libu liii lilb lili lill lilo lilu lio- lip- lipb lipi lipl lipo lipp lipu llll lloo lob- lobb lobi lobo loiu loli loll lolo loob lool loop lopi lopp lopu loui loul loup louu lppl luli lull lulu lupi lupo lupu luup obbo oblu oboi obol oiii olbo olib olio olli ollo oobi oolo oooo opii opio opo- oppi oppo ouii oulu ouu- pbil pblu pibb pibi piip pil- pili pill pilo pilu piob pipi pipo pipp plib plio plip plob ploo plop plou plpp plup pobo poil poio poli poll polo polu pool poop pop- popi popo popp poui poul poup ppib ppli pplo pppo pppp publ pubu puiu puli pull pulo pulp pulu pupi pupl pupu ubbi ubbo ubii ubli ublo uipi ulli ullo ulo- ulul uplb uplo uppp uppu upup uulu uuuu