bbbb bboy bbyo bcbc bccc bctc bcvo bobb bobo boby boco boob booc boot botb boto bott boty bovo bovy boyo btcc btob bttb byob byoc c-bo cbbc cbcc cbct cbot cbtc cbtv cbvb cbyt ccbc cccb cccc cccv ccob ccoc cctb cctc cctt cctv ccvo cobb cobo coby coco coct coob coot cotb cotc coto cott coty covo covy coyo coyt ctot ctvo ctvt cvcc cybb cybc cybo cyc- cycb cycc cyt- cytb cyto cyy- cyyc obbo obby obot oboy ocbc occc occt oct- octo octy ooby oooo ootb ooty oto- otoo otov otoy otto ovo- ovoo ovot tbcb tbcc tcby tccc tcov tctc to-y tobo tobt toby toco toot totc toto tott toty tovo toyb toyo toyt ttbb ttoy tttt tvtv tvyo tybo tyco tyto tytt tyty vbcc vbyv vooc voot voto vvob vvvv yccc yctc yobo yoot yott yoyo yvto yyyy