bbbb bboy bbrc bbyo bcbc bccc bcor bctc bobb bobo boby boco boob booc boor boot bor- boro borr bort bory botb boto bott boty boyo brcb brob broc broo bror brot brrr brtc bry- bryo btcc btob btor btrc btrt btry bttb byob byoc byrt c-bo cbbc cbcc cbcr cbct cbot cbrt cbry cbtc cbyt ccbc cccb cccc ccob ccoc ccrc ccrt cctb cctc cctt cobb cobo coby coco coct coob coot cor- corb corc coro corr cort cory cotb cotc coto cott coty coyo coyr coyt crbc crcc crcr crob croc croo cror crot croy crrt crtc cry- cryb cryo ctor ctot ctrc cybb cybc cybo cyc- cycb cycc cyrt cyt- cytb cyto cyy- cyyc obbo obby obor obot oboy obro ocbc occc occt ocro ocrr oct- octo octy ooby oocr oooo oort oory ootb ooty orbb orbo orby orco oro- oror orot oroy orro orry ortc orto oto- otoo otor otoy otro otry otto otyr rbbb rbbr rcbc rcbo rccb rccc rctc rcyc rob- robb robo robt roby rocc roco roob roor root rorc roro rort rory rotc roto rotr rott roty royt rrrr rtcc ryob ryot rytt ryyt tbcb tbcc tbrb tcby tccc tctc to-y tobo tobt toby toco toor toot torc toro torr tort tory totc toto totr tott toty toyb toyo toyt trcc troc troo trot troy trtc trtr try- tryb tryo ttbb ttoy tttt tybo tyco tyr- tyro tyrr tyto tytt tyty ybor ybry yccc yctc yobo yoot yoro yort yory yott yoyo yyyy