cccc ccee ccrc ccre ccrt cctc cctt cec- cece cect ceec cer- cerc cere cert cet- cete ceze crcc crce crcr crcz cre- crec cree cret crrt crtc ctec ctrc eccc ecce ecct ecrc ecrr ect- ectc eeee eerc eetc eete eeze ercc erce erec erer eret erez errc erre ertz etcc etec etee eter etre ette ezer rccc rcet rctc recc rece recr rect recz reet rere rert rete retr rett retz reze rrrr rtcc rtce rtee tccc tctc tecr tect teec teer teet teez ter- terc tere terr tete tetr tett tetz tezz trcc tre- trec tree tret trez trtc trte trtr tter tttt tzzt zert zete zeze zrce zrze zzzz