bbbb bblb bbpr bffl bfpo bfpp bftt bibb bibi bibl bibo biff bifi bili bill bilo bilt bio- bioi biol biot bipp birb biri birl biro birr birt bito bitt blbt blio blip blir blit blob bloo blop blot bobb bobi bobo boff boi- boii boil boit boli boll bolo bolt boob boof bool boop boor boot bopp bor- borf bori boro borr bort botb boti boto bott bpfl bpot bptf bpti bril brio brit brlp brob brol broo bror brot brrr btbp btlp btob btor btrt bttb fbop ffff ffii ffrr fftf fibp fiff fifi fifo fift fiii fiil fili fill filo fior fipp fiti fitt flii flip flit flob floo flop flor flot fobt fofo foil foli foll folo folr folt foof fool foot fopp for- forb fori forl foro forr fort foti foto fotp fott fprf frib fril frio frip frit frob frol frop frot ft-l ftii ftlb ftop ibfi ibot ibri ibro ibtb ibtl ifbb ifil ifit ifor ifpo ifrb ifrf ifri ifto iiii iiio iiit iioi iioo iiop iipf iitr iitt ilio ilir ilit ill- illi illo illp illt iloo ilot ilpr iobi ioii ioio ioit iolo ioof iooi iooo iopl iori iotf ioto ipil iplo ipop ippf ippo ippr ipri ipto irbp iri- iril irio irip irlb irob irop irri irtf irti irtp itif itil itll itof itoi itol itoo itor itrf itri ittf itto lblr lbrt lftp libo libr liff lifl lifo lift liii liir lilb lili lill lilo lilt lio- lior lip- lipb lipi lipl lipo lipp liri lirl liro lirp lirr lirt litb liti litl lito litr litt llll lloo lob- lobb lobi lobo loff lofi loft loif loir loit loli loll lolo loob loof lool loop loor loot lopi lopp lori loro loti lotl loto lotr lott lpfp lpft lppl lprp lptb lrif lroi lrrr ltbf ltbl ltib lttr obbo obit oboi obol obor obot obri obro off- offo offr ofit ofor oftp oiii oirt oiti olbo olib olio olit olli ollo olof olor olot oobi ooff oolo oooo oort ootb ootp opii opio opit opo- opor oppi oppo opti opto orbb orbi orbo orff orfi ori- orif oril orio orit orlo oro- orof oror orot orpi orri orro orto otfp otif otit oto- otof otoo otor otpp otro otti otto pbil pbrf pfff pffr pfft pfit pfli pibb pibi piff piip pil- pili pill pilo pilt piob piot pipi pipo pipp piri pirl piro pirr pitf piti pito pitr pitt plbr plff plib plif plio plip plit plob ploo plop plot plpp plri pltf pltt pobo poff pofi poil poio poli poll polo polt poof pool poop poor poot pop- popi popo popp popt porb pori poro porr port potf poti poto pott ppib ppif ppli pplo pppo pppp pprf pptt pri- prif prii prlr pro- prob prof prol proo prop prot prri prti prtp prtr ptbl ptol ptop ptrf rbbb rbbr rffl rib- ribo riff rift riif rill rilo rilp riol riot ripi ripl ripp ripr ript riri riti ritl rito ritt rlif rob- robb robi robo robt roff rofl rofo roif roil roio roir roit rolf roll rolo rolp rolt roob roof rooi rool roop roor root ropo rori roro rort roti rotl roto rotr rott rpii rpob rpof rrif rrrr rtbf rtfb rtlt rttp tbil tbit tbrb tbtp tfot tfpt tftp tibi tiff tifo tift tiit till tilo tilr tilt tiop tip- tipi tipo tipp tipt tirb tiri tirl tiro tirr titi tito titp titt tlli tobi tobo tobt toff tofi tofo toft toil toit tol- toli toll tolo tolt toof tool toor toot top- topf topi topo topp topt torf tori toro torp torr tort toti toto totr tott tpir tpol tppp tppr tptp tptr trfr tri- trib trif tril trio trip trit troi troo trop trot trpp trtr ttbb ttff ttop tttt