bbbb bbch bbfc bblb bcbc bccc bccl bcfc bcof bctc bffl bftt bhcc bhff bhot blbt blfc blob bloc bloo blot bobb bobo boch boco boff bofh bohl boho boht boll bolo bolt boob booc boof booh bool boot botb both boto bott btcc btcl btfc btob bttb c-bo cbbc cbcc cbcl cbct cbfb cbfc cbhl cblb cblc cbol cbot cbtc cbtf cbtl ccbc cccb cccc cccf cccl ccfc ccff ccfl cchl cclc ccob ccoc cctb cctc cctl cctt cfbc cfbt cfcb cfcf cfcl cfco cffb cftc cfth cftl chch chfc chlc chlt choc choh chol choo chto chtt clob clof cloo clot cltb cltc cobb cobh cobo coch coco coct cofc coff coft coho col- colb coll colo colt coob coof cooh cool coot cotb cotc coth coto cott ctcf ctfc ctfo ctol ctot fccf fcch fcot fcto ffcc ffff fftf fhlb flcl flob floc floo flot fobt foch foco fofo folc foll folo folt foof fool foot foth foto fott ft-c ft-l ftfc ftlb hbfc hboc hbtl hcbc hccb hccc hcch hcfc hhcl hhhh hhof hltf hobo hoch hoff hohl hoho hol- holb holc holh holl holo holt hoof hool hoot hotb hoth hotl hoto hott htcc htfc htoh htol lbcc lcbc lccc lcfc lchc lctl lcto lfcc lhhh llcc lllc llll lloc lloo lob- lobb lobh lobo locc loch loco loff loft loho loll lolo loob looc loof lool loot loth lotl loto lott ltbf ltbl ltcc ltfc lttc obbo obol obot ocbc occc occt ocht oclc oct- octo ofcl off- offc offh offo ohcc ohho ohob ohoh ohto olbo olcc ollo olof olot ooff ooho oolo oooh oooo ootb otcl otfc otho oto- otof otoh otoo otto tbcb tbcc tccc tcfc tch- tchh tcho tctc tfot tftc thch thof thoo thot thtb tlco tobo tobt toch toco toff tofo toft toho tol- toll tolo tolt toof tooh tool toot totc toth toto tott ttbb ttfc ttff tttt