scsn scso scsr scst sctc sctd sctn scto sctr scts sdcc sdco sddc sdds sder sdes sdet sdot sdrc sdrs sdsc sdss se-c se-d se-e se-n se-o se-s se-t sec- secc secd sece secn seco secr secs sect sede sedo seds seec seed seen seer sees seet send sene senn seno senr sens sent seoc seod seon serc serd sere sern sero serr sers sert sesc sese seso sess sest set- setc sete seto sets sett sncc snco sned snee sner snes snet snns snoc snod snoo snor snos snot snrs snsd snte sntr soce soco socr socs sodd sode sodo sods soec soen soeo soes son- sond sone sono sons sont sood soon soor soos soot sord sore sorn soro sorr sors sort sose soso soss sost sotc sote sotn soto sots srcc srct srde srec sreo sres srnn srno sros srsd srtr sscc ssce sscs ssdc ssdd ssec ssee sses sset ssns ssoc ssot ssrc ssrs sssc ssss sstc sstd ssts stcc stcs stds stec sted stee sten steo ster stes stet stnd stnn stnr stns stod stoe ston stoo stor stos stot strc strd stre strn stro strs stss sttc sttd sttr tccc tcdd tcnn tcon tcos tctc tcts tdes tdor tdse tdss teco tecr tecs tect tedd tede teds teec teed teen teer tees teet tenc tend tene tenn teno tens tent teon teor teos ter- terc tere tern tero terr ters tesc tesd tese teso tess test tete teto tetr tets tett tncc tndd tnes tnts toce toco todd tode todo tods todt toed toee toen toer toes toet tone tonn tono tons tood toon toor toos toot torc tord tore torn toro torr tors tort tosc tose toso toss tost totc totd tote toto totr tots tott trcc tre- trec tred tree tren treo tres tret trno troc trod troe tron troo tros trot trsd trst trtc trte trtr tscc tsec tsen tses tset tsos tsse tssr tsst tstc tsts ttcn tten tteo tter ttoe tton ttss tttt