bbbb bbch bblb bcbc bccc bccl bctc bhcc bhot blbt blob bloc bloo blot bobb bobo boch boco bohl boho boht boll bolo bolt boob booc booh bool boot botb both boto bott btcc btcl btob bttb c-bo cbbc cbcc cbcl cbct cbhl cblb cblc cbol cbot cbtc cbtl ccbc cccb cccc cccl cchl cclc ccob ccoc cctb cctc cctl cctt chch chlc chlt choc choh chol choo chto chtt clob cloo clot cltb cltc cobb cobh cobo coch coco coct coho col- colb coll colo colt coob cooh cool coot cotb cotc coth coto cott ctol ctot hboc hbtl hcbc hccb hccc hcch hhcl hhhh hobo hoch hohl hoho hol- holb holc holh holl holo holt hool hoot hotb hoth hotl hoto hott htcc htoh htol lbcc lcbc lccc lchc lctl lcto lhhh llcc lllc llll lloc lloo lob- lobb lobh lobo locc loch loco loho loll lolo loob looc lool loot loth lotl loto lott ltbl ltcc lttc obbo obol obot ocbc occc occt ocht oclc oct- octo ohcc ohho ohob ohoh ohto olbo olcc ollo olot ooho oolo oooh oooo ootb otcl otho oto- otoh otoo otto tbcb tbcc tccc tch- tchh tcho tctc thch thoo thot thtb tlco tobo tobt toch toco toho tol- toll tolo tolt tooh tool toot totc toth toto tott ttbb tttt