bbbb bbch bbdd bbdo bbrc bcbc bccc bchd bcor bd-r bdbc bddc bddh bhcc bhor bobb bobo boch boco bodb bodh bodo bohd boho bohr boob booc bood booh boor bor- bord borh boro borr brcb brdo brob broc brod broh broo bror brrr c-bo c-cd cbbc cbcc cbcr cbdb cbdc cbdo cbrd cbrh ccbc cccb cccc ccdc ccdh ccdr cchr ccob ccoc ccod ccrc cd-r cddb cddr chch choc chod choh choo chor chrb chrc chrd chro chrr cobb cobh cobo coch coco codd coho coob cood cooh cor- corb corc cord coro corr crbc crcc crcr crdc crob croc crod croh croo cror d-bo dbcc dcbc dccb dccc dcdb dddd ddoc ddrc dhod dhor dobb doch doco dod- dodd dodo dohc dohr doob dood door dorc dord doro dorr drbc drob drod droh hbcd hboc hcbc hccb hccc hcch hcdr hcrd hdoc hdod hhhh hobo hoch hocr hodh hodr hoho hood hoor horc hord horo horr hrdc hrob hrod hrrc obbo obor obrh obro ocbc occc ocro ocrr odbo oddd odoh odoo odor ohcc ohho ohob ohoh oocr ooho oooh oooo oord orbb orbo orch orco ordo oro- oror orro rbbb rbbr rboh rcbc rcbo rccb rccc rcdc rchb rcrd rdoc rhob rhoc rhod rhoh rob- robb robo rocc roch roco rodd rodo rohr roob rood roor rorc roro rrrr