bbbb bbdd bbdo bbfc bbfn bbrc bcbc bccc bcfc bcof bcor bd-r bdbc bddc bnoc bnor bnrr bobb bobo boco bodb bodo bofd boff bonc bond bonn bono boob booc bood boof boon boor bor- bord borf born boro borr brcb brdo brfc brno brob broc brod bron broo bror brrr c-bo c-cd cbbc cbcc cbcn cbcr cbdb cbdc cbdn cbdo cbfb cbfc cbnd cbrd cbrn ccbc ccbn cccb cccc cccf ccdc ccdf ccdn ccdr ccfc ccfd ccff ccnb ccnc ccnf ccnr ccob ccoc ccod ccrc ccrf cd-r cdbf cddb cddr cdnb cdnc cdnf cdon cfbc cfbn cfbr cfcb cfcf cfcn cfco cffb cffr cfnb cfnr cfor cfrb cfrn cnbc cnco cndd cnrc cnrr cobb cobo coco codd cofc coff con- conc cond conf conn cono coob cood coof coon cor- corb corc cord corf corn coro corr crbc crcc crcr crdc crfc crob croc crod cron croo cror d-bo dbcc dbfc dbfo dbrn dcbc dccb dccc dcdb dcfc dcon dddd ddoc ddrc dfcc dfco dfrf dnoc dnrc dobb doco dod- dodd dodo doff donc dond donn dono donr doob dood doof doon door dorc dord dorf dorn doro dorr drbc drfc drno drob drod drof dron fccf fdoc ffcc ffff ffrr fndd fndn fndr foco fofo fond fono food foof foon for- forb ford forn foro forr frbc frcc frcn frfc frob fron nbbc nbbo nbcc nbco nbfc ncbc nccc nccf nccn nccr ncdc ncdn ncdr ncfc ncnc ncnd ncoc ncor ncrc ndcc nddb nddo ndoc ndor ndrc ndrf nfdc nfff nfon nndb nnnn nobc nobo noco nodo non- nonn nono noo- noob noon nooo noor nor- norb norc nord norf norn noro norr nrdc nrfc nroc nron nrrc nrrd obbo obon obor obro ocbc occc occn ocon ocro ocrr odbo oddd odnb odon odoo odor ofcr ofdr off- offc offo offr ofno ofor onc- oncd oncf onco ondo onno onod onon onor oocr ooff oooo oord orbb orbo orco ordn ordo orff ornc orno oro- orof oron oror orro rbbb rbbr rcbc rcbo rccb rccc rcdc rcfc rcnr rcon rcrd rdoc rffc rnbr rnco rndc rndf rnod rob- robb robo rocc roco rodd rodo rofc roff rofo ronc rond rono roob rood roof roon roor rorc roro rrfc rrrr