bbbb bbci bblb bcbc bccc bcci bccl bcit bctc bibb bibi bibl bibo bicc bici bico bili bill bilo bilt bio- bioc bioi biol biot bitc bito bitt blbt blic blio blit blob bloc bloo blot bobb bobi bobo boco boi- boii boil boit boli boll bolo bolt boob booc bool boot botb boti boto bott btcc btcl btob bttb c-bo cbbc cbcc cbcl cbct cbit cblb cblc cbol cbot cbtc cbtl ccbc cccb cccc ccci cccl ccic ccii ccil cclc ccli ccob ccoc cctb cctc cctl cctt cibc cibi cibo cicc cici cico cict ciii ciit cili cill cilo cilt ciob citb citi citl cito citt clib clic clii clio clit clob cloo clot cltb cltc cobb cobi cobo coco coct coil coit col- colb coli coll colo colt coob cool coot cotb cotc coti coto cott ctbi ctic ctol ctot ibot ibtb ibtc ibtl icbc iccb iccc icci iccl icco icct icll icoc iiii iiio iiit iioi iioo iitt ilbc ilic ilio ilit ill- illi illo illt iloc iloo ilot iobi ioci ioii ioio ioit iolo iooi iooo ioto itic itil itll itoi itol itoo itto lbcc lcbc lccc lctl lcto libc libo lico lict liii lilb lili lill lilo lilt lio- litb liti litl lito litt llcc lllc llll lloc lloo lob- lobb lobi lobo locc loci loco loic loit loli loll lolo loob looc lool loot loti lotl loto lott ltbl ltcc ltci ltib lttc obbo obit oboi obol obot ocbc occc occi occt oclc oct- octi octo oici oiii oitc oiti olbo olcc olib olic olio olit olli ollo olot oobi oolo oooo ootb otcl otic otit oto- otoo otti otto tbcb tbcc tbil tbit tccc tctc tibi ticc tico tiit till tilo tilt titc titi tito titt tlco tlli tobi tobo tobt toci toco toil toit tol- toli toll tolo tolt tool toot totc toti toto tott ttbb tttt