nrrc nrsa nrsc nsaa nsac nsar nsca nscc nscs nseb nsec nser nsna nsnr nsra nsrc nssa nssb nssc nsse nssr nsss raab raag raan raas raba rabb rabe rabs rac- raca racc race racs raec raeg raen raer raes raga rage ragg rags rana ranc rane rang rann rans rara rarb rare rars rasa rasc rase rass rbbb rbbr rbbs rbss rcac rcas rcbc rccb rccc rccs rcga rcgc rcnr rcrg rcsa rcsc rcss rea- reac reae rean rear reas reba rebb rebe rebs reca recc rece recr recs reeb reen rees rega rege regn regr regs rena rene reng renn rens rera rere rerg rers resa rese resn ress rgan rgba rgbe rnag rnas rnbr rncs rngs rras rrna rrrr rsaa rscc rscn rscs rsee rsgb rsgc rsna rsnn rsnr rsre rssa sa-c saab saac saae saag saan saar saas saba sabb sabc sabe sabr sabs saca sacc sace sacn sacr sacs saeb saen saer saes saga sage sagg sags sana sane sang sann sanr sans sara sarc sare sarg sarn sarr sars sasa sasc sase sass sbaa sbac sbar sbas sbbs sbca sbcc sbcs sber sbsa sbse scaa scab scac scag scan scar scas scba sccc scce sccs scea scec scee sceg scer scgs scna scnr scr- scra scrc scre scrn scrs scsa scsc scsn scsr se-c se-e se-g se-n se-s seaa seab seac sean sear seas seba sebe sebs sec- seca secc sece secg secn secr secs seea seeb seec seeg seen seer sees sega sege segg segs sena sene seng senn senr sens sera serb serc sere serg sern serr sers sesa sesc sese sess sgaa sgac sgca sgcb sgce sgcg sger sges sggg sggs sgss snab snag snar snas snba snca sncc sneb snee sneg sner snes snns snra snrs sras srbc srcc sreb srec sres srgb srna srnn ssaa ssab ssac ssan ssas ssbn ssbr ssca sscc ssce sscs ssec ssee sses ssgs ssns ssra ssrc ssrg ssrs sssa sssb sssc ssss