bbbb bbci bcbc bcbg bccc bcci bcit bctc bibb bibi bibo bicc bicg bici bico bigb bigc bigg bigo bigt bio- bioc biog bioi biot bitc bito bitt bobb bobi bobo boco bogg bogi bogo bogt boi- boii boit boob booc boog boot botb boti boto bott btcc btob bttb c-bo cbbc cbcc cbct cbgb cbit cbot cbtc ccbc cccb cccc ccci ccgc ccgt ccic ccii ccob ccoc cctb cctc cctt cgcc cgcg cibc cibi cibo cicc cici cico cict cigi ciii ciit ciob citb citg citi cito citt cobb cobi cobo coco coct cogi cogo coit coob coot cotb cotc coti coto cott ctbi ctic ctot gbbo gc-c gcbc gccc gcic gcii gctc ggbt gggg gibb gigg gigi gigo giog gioi gito gobi gobo gogi gogo goit goog gooi goot goti goto gott gtco i-go ibot ibtb ibtc icbc iccb iccc icci icco icct icgc icoc igbc igbo igcc igoo igot iiii iiio iiit iioi iioo iitt iobi iocg ioci iogt ioii ioio ioit iooi iooo ioto itgc itgo itic itoi itoo itto obbo obit oboi obot ocbc occc occi occt oct- octi octo ogb oggi ogog ogoi oici oigo oiii oitc oiti oobi oooo ootb otic otit oto- otog otoo otti otto tbcb tbcc tbit tccc tctc tgcc tgtc tibi ticc tico tigi tiit titc titi tito titt tobi tobo tobt toci toco togo togt toit toot totc toti toto tott ttbb tttt