bbbb bblb bibb bibi bibl bili bill bilt bilu bipp bipu bitt bitu blbt blip blit blub blup blut bpti btbp btlp bttb bubb bubi bubu buit buiu bulb buli bull bult bulu but- buti butt ibtb ibtl iiii iiit iitt ilit ill- illi illp illt ilut ipil iput itil itll itup iuiu iupp libu liii lilb lili lill lilt lilu lip- lipb lipi lipl lipp lipu litb liti litl litt litu liut llll lppl lptb ltbl ltib luit luli lull lulu lupi lupu luti luup pbil pblu pibb pibi piip pil- pili pill pilt pilu pipi pipp piti pitt pitu plib plip plit plpp pltt plup ppib ppli pppp pptt ptbl ptui publ pubu puit puiu puli pull pulp pult pulu pupi pupl pupu put- puti putt putu tbil tbit tbtp tibi tibu tiit tiiu till tilt tip- tipi tipp tipt tipu titi titp titt titu tlli tppp tptp tput ttbb tttt ttul tubb tubu tuil tuit tuiu tuli tull tulp tulu tupi tupu tuti tutl tutt tutu ubbi ubii ubit ubli uipi ulli ulti ultt ulul uplb uppp uppu uptl upup util utti uttu uulu uuuu