bbbb bbcm bcbc bccc bccm bctc bmoc bmtc bobb bobo bocm boco bomb bomt boob booc boom boot botb boto bott btcc btob bttb c-bo cbbc cbcc cbcm cbct cbot cbtc ccbc cccb cccc cccm ccmb ccmc ccmm ccob ccoc ccom cctb cctc cctt cmbc cmcc cmmb cmmc cmoc cmot cmtc cobb cobo coco coct com- comb comc comm como coob coom coot cotb cotc coto cott ctmo ctot mcbc mccc mcmc mcmt mcot mctc mmcc mmcm mmct mmmc mmmm mobb mobo moco momo moob mooc moot motb motm moto mott mtbc mtbo mtom obbo obot ocbc occc occt ocom oct- octo ombo omo- omoo oooo ootb oto- otoo otto t-mo tbcb tbcc tccc tcom tctc tmbc tmcc tmcm tmtt tobo tobt toco tomb tomm tomo tomt toom toot totc totm toto tott ttbb tttt