stss sttc sttd sttr tccc tcdd tcfc tcos tctc tcts tdes tdff tdor tdse tdss teco tecr tecs tect tedd tede teds teec teed teef teer tees teet tefc teff teft teor teos ter- terc tere terf tero terr ters tesc tesd tese teso tess test tete teto tetr tets tett tfdc tfec tfot tfrs tfsd tfss tftc toce toco todd tode todo tods todt toed toee toer toes toet toff tofo toft tood toof toor toos toot torc tord tore torf toro torr tors tort tosc tose toso toss tost totc totd tote toto totr tots tott trcc tre- trec tred tree tref treo tres tret trfc trfd trfr troc trod troe troo tros trot trsd trst trtc trte trtr tscc tsec tses tset tsfc tsos tsse tssf tssr tsst tstc tsts tteo tter ttfc ttff ttoe ttss tttt