krcb krcc krce krcg krch krco krcs kreb krec kree kreh krek kreo kres krgs krhc krhs krkc krke krkh krkk krko krkr krks krob kroc kroe krog kroh krok kroo kror kros krrb krrc krre krrg krrk krro krrr krrs krsc krse krsh krsk krsr krss ksbc ksbh ksbr ksbs kscb ksce ksch ksck ksco kscr kscs ksec ksee kseg kseh ksek kseo kser ksgc ksgg ksgr kshb kshe kshk ksho kshr kshs kskb kske kskg kskk ksko kskr ksks ksob ksoc ksok ksoo ksor ksos ksrb ksrg ksrh ksro ksrr ksrs ksse ksso kssr ksss o-eo obbo obec ober obes obhs obkb oboe obok obor obos obre obrh obro obsr obss ocbc occc oce ocee oche ochs ocke ocks ocos ocre ocro ocrr ocrs oec- oecc oeec oegb oere oers oese ogb ogbe ogee oger ogge oghs ogog ogre ogro ohbe ohcc ohee oher ohgr ohho ohhs ohob ohoh ohok ohos ohre ohso ohss okeh oker okes okgo okko okok okor okre okro okso oobe oocr ooer ooes ooho oohs oooh oooo ooos oore oose orbb orbe orbo orbs orce orch orco orcs ore- oreb orec oreg oreh orek oreo orer ores orge orgo orgs orhe orhs orke orko oro- oroe orok oror oros orro orrs orse orsk orso osbe oscc osce osco osec osee oseh osek oser oses oshc oshe osho oshs osoo osor osos osro ossb osse osso rbbb rbbr rbbs rbgh rbhs rboh rbss rcbc rcbo rccb rccc rccs rcgc rchb rchs rcos rcrg rcsc rcss rebb rebe rebk rebo rebs recc rece rech reck recr recs reeb reek rees rege rego regr regs rehb rehe rehs reke reko reks reog reos rere rerg rero rers rese resh reso ress rgbe rghs rhbg rhce rhcg rheb rhee rheo rhes rhhs rhob rhoc rhog rhoh rhos rkos rkss rob- robb robe robo robs rocc roce roch rock roco rocs roeg roer roes roge rogg rogh rogo rohe rohr rohs roke rokh rokk roko rokr roks roob roog rook roor roos rorc rore rork roro rosc rose rosh roso ross rrhs rrrr rscc rsch rscs rsee rsgb rsgc rshs rsos rsre s-os sbbs sbcc sbcs sber sbhc sbhk sbhs sbor sbrk sbse sccc scce sccs scec scee sceg scer scgs sch- sche schh scho schr schs sck- scob scog scoh scok scoo scor scr- scrc scre scrs scsc scsh scso scsr se-c se-e se-g se-h se-k se-o se-s sebe sebo sebs sec- secc sece secg sech seck seco secr secs seeb seec seeg seeh seek seer sees sege segg segh sego segs sehe sehk sehr sehs seke sekk seko seoc seok serb serc sere serg serk sero serr sers sesc sese sesh seso sess sgcb sgce sgcg sger sges sggg sggs sghc sghs sgro sgsh sgss shbs shcc she- sheb shee sheh shek sheo sher shes shgc shgr shhh shhs shoe shog shok shoo shor shos shre shrs shsc skee skeg skeo sker skes skhs skoe skog skor skss sobe sobo sobr sobs soce soch sock soco socr socs soec soeo soes sogh sogo sogs sohh soho sohs soke sokk soko soog sook soor soos sorb sore sorg sorh soro sorr sors sose sosh soso soss srbc srcc srch sreb srec sreo sres srgb srhs sros ssbr sscc ssce sscs ssec ssee sses ssgs sshs ssoc ssrc ssrg ssrs sssb sssc sssh ssss