bbbb bblb bffl bfpo bfpp bftt bibb bibi bibl bibo biff bifi bili bill bilo bilt bio- bioi biol biot bipp bito bitt blbt blio blip blit blob bloo blop blot bobb bobi bobo boff boi- boii boil boit boli boll bolo bolt boob boof bool boop boot bopp botb boti boto bott bpfl bpot bptf bpti btbp btlp btob bttb fbop ffff ffii fftf fibp fiff fifi fifo fift fiii fiil fili fill filo fipp fiti fitt flii flip flit flob floo flop flot fobt fofo foil foli foll folo folt foof fool foot fopp foti foto fotp fott ft-l ftii ftlb ftop ibfi ibot ibtb ibtl ifbb ifil ifit ifpo ifto iiii iiio iiit iioi iioo iiop iipf iitt ilio ilit ill- illi illo illp illt iloo ilot iobi ioii ioio ioit iolo ioof iooi iooo iopl iotf ioto ipil iplo ipop ippf ippo ipto itif itil itll itof itoi itol itoo ittf itto lftp libo liff lifl lifo lift liii lilb lili lill lilo lilt lio- lip- lipb lipi lipl lipo lipp litb liti litl lito litt llll lloo lob- lobb lobi lobo loff lofi loft loif loit loli loll lolo loob loof lool loop loot lopi lopp loti lotl loto lott lpfp lpft lppl lptb ltbf ltbl ltib obbo obit oboi obol obot off- offo ofit oftp oiii oiti olbo olib olio olit olli ollo olof olot oobi ooff oolo oooo ootb ootp opii opio opit opo- oppi oppo opti opto otfp otif otit oto- otof otoo otpp otti otto pbil pfff pfft pfit pfli pibb pibi piff piip pil- pili pill pilo pilt piob piot pipi pipo pipp pitf piti pito pitt plff plib plif plio plip plit plob ploo plop plot plpp pltf pltt pobo poff pofi poil poio poli poll polo polt poof pool poop poot pop- popi popo popp popt potf poti poto pott ppib ppif ppli pplo pppo pppp pptt ptbl ptol ptop tbil tbit tbtp tfot tfpt tftp tibi tiff tifo tift tiit till tilo tilt tiop tip- tipi tipo tipp tipt titi tito titp titt tlli tobi tobo tobt toff tofi tofo toft toil toit tol- toli toll tolo tolt toof tool toot top- topf topi topo topp topt toti toto tott tpol tppp tptp ttbb ttff ttop tttt