bbbb bboy bbyo bcbc bccc bctc bcuc bobb bobo bobu boby boco bocu boob booc boot botb boto bott boty bout bouy boyo btcc btob bttb bubb bubo bubu bucc buco bucu buoy but- buto butt buty buyo buyu byob byoc c-bo cbbc cbcc cbct cbcu cbot cbtc cbyt ccbc cccb cccc cccu ccob ccoc cctb cctc cctt ccuc ccut cobb cobo cobu coby coco coct cocu coob coot cotb cotc coto cott cotu coty coub cout couy coyo coyt ctot cub- cubb cuby cucc cut- cutc cuto cutt cuy- cuyo 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 otoy otto ottu oucc out- outb outo outy ouu- oyou tbcb tbcc tcby tccc tccu tctc to-y tobo tobt tobu toby toco toot totc toto tott toty tout toyb toyo toyt ttbb ttoy tttt tubb tubo tubu tucc tuco tuto tutt tutu tuty tuuo tybo tyco tyto tytt tyty ubbo uboc ucbc ucut uocc utby utoy utto uttu uuoc uuuu yccc yctc yobo yoot yott youb yout yoyo yubu yuto yutu yuty yuyu yyyy