rbss rcac rcas rcbc rccb rccc rccs rcnr rcsa rcsc rcss rkss rnas rnbr rncs rras rrna rrrr rrun rsaa rscc rscn rscs rsna rsnn rsnr rssa rsua ruan ruas ruba rubb rubs rubu ruca ruck ruka rukk rukn ruku runa runc runk runn runs rura rurc rurs ruru rusa rusk russ rusu ruun sa-c saab saac saak saan saar saas saba sabb sabc sabr sabs sabu saca sacc sack sacn sacr sacs sacu saka sakb sakk saks saku sana sank sann sanr sans sanu sara sarc sark sarn sarr sars saru sasa sasc sask sass saua sauc sauk saun saur saus sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbrk sbsa sbus scaa scab scac scak scan scar scas scba sccc sccs sck- scna scnr scr- scra scrc scrn scrs scsa scsc scsn scsr scsu scua scub scun scur skab skac skan skar skn- skra skss skua skun skur snab snak snar snas snba snca sncc snns snra snrk snrs snub snur snus sras srbc srcc srna srnn srub ssaa ssab ssac ssan ssas ssau ssbn ssbr ssca sscc sscs ssns ssra ssrc ssrs sssa sssb sssc ssss suan suar suas sub- suba subb subs suc- succ suck sucr sucs suka suks suku sun- suna sunb sunk sunn suns sunu sur- sura surc surn surr surs suru sus- susa susk suss susu suus uabc uaca uarc uars uaru uasa uaua ubac ubar ubba ubra ucak ucan ucar ucas ucbc ucca ucka ucrc ucsa ucsb ucsc ucsu ucua ukba ukcc uknc ukra ukrc uksa uksc ukur unaa unac unan unar unas unau unca uncc uncs unka unkn unks unna unns unra unrs uns- unsa unsc unus urac uran uras urau urba urbs urca urka urna urns urra ursa urss ursu uruk urun urur urus us-a us-k usaa usac usak usan usar usas usba usbc usbr usbs usca uscc uscs uska usna usnc usnr usnu usra ussa ussb ussc ussr usss ussu usua usun usus uuuu