cccc ccee ccoc ccrc ccre ccrt cctc cctt cec- cece ceco cect ceec ceor cer- cerc cere cero cert cet- cete ceto coce coco coct coot cor- corc core coro corr cort cotc cote coto cott crcc crce crcr cre- crec cree creo cret croc croe croo cror crot crrt crtc ctec ctor ctot ctrc eccc ecce ecco ecct eco- ecot ecrc ecrr ect- ectc ecto eeee eeoc eerc eero eetc eete eore eotc eoto ercc erce erec erer eret eroc eroe eroo errc erre erro etcc etco etec etee eter etoe etre etro ette etto o-eo occc occt oce ocee ocet ocre ocro ocrr oct- octe octo oec- oecc oeec oere oocr ooer oooo oore oort orce orco ore- orec oreo orer oro- oroe oror orot orro ortc orte orto otee oter oto- otoe otoo otor otre otro otte otto rccc rcet rctc recc rece recr rect reet reot rere rero rert rete reto retr rett rocc roce roco roer roet roor root rorc rore roro rort rotc rote roto rotr rott rrrr rtcc rtce rtee tccc tctc teco tecr tect teec teer teet teor ter- terc tere tero terr tete teto tetr tett toce toco toee toer toet toor toot torc tore toro torr tort totc tote toto totr tott trcc tre- trec tree treo tret troc troe troo trot trtc trte trtr tteo tter ttoe tttt