bbbb bbdd bbdo bbrc bcbc bccc bcor bd-r bdbc bddc bnoc bnor bnrr bobb bobo boco bodb bodo bonc bond bonn bono boob booc bood boon boor bor- bord born boro borr brcb brdo brno brob broc brod bron broo bror brrr c-bo c-cd cbbc cbcc cbcn cbcr cbdb cbdc cbdn cbdo cbnd cbrd cbrn ccbc ccbn cccb cccc ccdc ccdn ccdr ccnb ccnc ccnr ccob ccoc ccod ccrc cd-r cddb cddr cdnb cdnc cdon cnbc cnco cndd cnrc cnrr cobb cobo coco codd con- conc cond conn cono coob cood coon cor- corb corc cord corn coro corr crbc crcc crcr crdc crob croc crod cron croo cror d-bo dbcc dbrn dcbc dccb dccc dcdb dcon dddd ddoc ddrc dnoc dnrc dobb doco dod- dodd dodo donc dond donn dono donr doob dood doon door dorc dord dorn doro dorr drbc drno drob drod dron nbbc nbbo nbcc nbco ncbc nccc nccn nccr ncdc ncdn ncdr ncnc ncnd ncoc ncor ncrc ndcc nddb nddo ndoc ndor ndrc nndb nnnn nobc nobo noco nodo non- nonn nono noo- noob noon nooo noor nor- norb norc nord norn noro norr nrdc nroc nron nrrc nrrd obbo obon obor obro ocbc occc occn ocon ocro ocrr odbo oddd odnb odon odoo odor onc- oncd onco ondo onno onod onon onor oocr oooo oord orbb orbo orco ordn ordo ornc orno oro- oron oror orro rbbb rbbr rcbc rcbo rccb rccc rcdc rcnr rcon rcrd rdoc rnbr rnco rndc rnod rob- robb robo rocc roco rodd rodo ronc rond rono roob rood roon roor rorc roro rrrr