krnb krnd krne krnk krnn krno krob kroc krod kroe krof krok kroo kror krrb krrc krre krrf krrk krrn krro krrr nbbc nbbo nbcc nbco nber nbfc ncbc nccc nccf nccn nccr ncdc ncdn ncdr ncec nced ncee ncef ncen ncer ncfc ncfe ncnc ncnd ncoc ncor ncrc ncre ndcc nddb ndde nddo nder ndoc ndor ndrc ndre ndrf nebb nebe nebn nebo nebr necc nece neck neco necr nedc nedd nede nedo neeb need neef neen neer nefd nefe neff neke neko nend nene neno neo- neoc neod neon neoo nerc nerd nere nerf nerk nero nerr nfdc nfer nfff nfon nkfc nkok nkor nkrf nndb nnnn nobc nobo noce nock noco node nodo noed noer noke noko non- none nonn nono noo- noob nook noon nooo noor nor- norb norc nord nore norf nork norn noro norr nrdc nren nrfc nroc nron nrrc nrrd o-eo obbo obec obed oben ober obkb oboe obok obon obor obre obro ocbc occc occn oce oced ocee ocef ocke ocon ocre ocro ocrr odbo oddd oded oden odeo oder odnb odon odoo odor oec- oecc oedn oedo oeec oen- oeno oere ofcr ofdr ofek ofen ofer off- offc offe offo offr ofno ofor ofre oked oken oker okko okno okok okon okor okre okro onc- oncd once oncf onco onde ondo one- oneb onec oned onee onek oneo oner onne onno onod onon onor oobe oocr ooer ooff oone oooo oord oore orbb orbe orbo orce orco orde ordn ordo ore- oreb orec ored orek oren oreo orer orfe orff orke orko ornc orne orno oro- oroe orof orok oron oror orro rbbb rbbr rcbc rcbo rccb rccc rcdc rcde rcfc rcnr rcon rcrd rder rdoc rebb rebe rebk rebo recc recd rece reck recr redc redd rede redo redr reeb reed reef reek reen refd refe reff refn refr reke reko rend rene renk renn reno reod reof rerd rere rero rfef rffc rkkf rnbr rnco rndc rndf rnod rob- robb robe robo rocc roce rock roco rodd rode rodo roed roen roer rofc rofe roff rofo roke rokk roko rokr ronc rond rone ronk rono roob rood roof rook roon roor rorc rore rork roro rred rrfc rrrr