rtcc rtce rtdt rtee rtes rtss rtts s-os sccc scce sccs scct scdc scds scec scee scer scet sck- scok scoo scor scot scr- scrc scre scrs scsc scsd scso scsr scst sctc sctd scto sctr scts sdcc sdco sddc sdds sder sdes sdet sdot sdrc sdrs sdsc sdss se-c se-d se-e se-k se-o se-s se-t sec- secc secd sece seck seco secr secs sect sede sedo seds seec seed seek seer sees seet seke sekk seko sekt seoc seod seok serc serd sere serk sero serr sers sert sesc sese seso sess sest set- setc sete seto sets sett sked skee skeo sker skes sket skoe skor skot skrt sksd skss soce sock soco socr socs sodd sode sodo sods soec soeo soes soke sokk soko sood sook soor soos soot sord sore soro sorr sors sort sose soso soss sost sotc sote sotk soto sots srcc srct srde srec sreo sres sros srsd srtr sscc ssce sscs ssdc ssdd ssec ssee sses sset ssoc ssot ssrc ssrs sssc ssss sstc sstd ssts stcc stcs stds stec sted stee stek steo ster stes stet stks stod stoe stok stoo stor stos stot strc strd stre strk stro strs stss sttc sttd sttr tccc tcdd tcos tctc tcts tdes tdkr tdor tdse tdss teck teco tecr tecs tect tedd tede tedk teds teec teed teek teer tees teet teke teok teor teos ter- terc tere terk tero terr ters tesc tesd tese teso tess test tete teto tetr tets tett tkod tkos tkts toce tock toco todd tode todo tods todt toed toee toek toer toes toet toke toko tood took toor toos toot torc tord tore tork toro torr tors tort tosc tose tosk toso toss tost totc totd tote toto totr tots tott trcc tre- trec tred tree trek treo tres tret troc trod troe troo tros trot trsd trst trtc trte trtr tscc tsec tses tset tsks tsos tsse tssr tsst tstc tsts tteo tter ttoe ttss tttt