-er -th c-- ccc cce cch cck cco ccr cct ce- cec cee ceh cek ceo cer cet ch- chc che chh chk cho chr cht ckc ckh cko ckt co- coc coe coh cok coo cor cot crc cre crh crk cro crr crt ctc cte cth ctk cto ctr ctt ec- ecc ece ech eck eco ecr ect eec eee eek eeo eer eet ehc ehe ehh eho ehr eht ekc eke ekh eko ekr ekt eo- eoc eoe eoh eok eoo eor eot erc ere erh erk ero err ert etc ete eth etk eto etr ett hcc hce hch hck hco hcr hct he- hec hee heh hek heo her het hhc hhe hhh hhk hho hhr hht hkh hkk hko hkr hkt hoc hoe hoh hok hoo hor hot hr- hrc hre hrh hrk hro hrr hrt htc hte hth htk hto htr htt k-t kcc kce kch kck kcr kct ke- kec kee keh kek keo ker ket khe khh khk kho khr kkc kke kkh kkk kkr kkt koc koe koh kok koo kor kot krc krk kro krr krt ktc kte kth ktk kto ktr ktt oc- occ och ock oco ocr oct oec oee oeh oeo oer oet ohc ohe ohh oho ohr oht okc oke okk oko okr oo- ooc ooh ook ooo oor oot or- orc ore orh ork oro orr ort ot- otc ote oth otk oto otr ott rcc rce rch rco rcr rct re- rec ree reh rek reo rer ret rh- rhc rhe rhh rho rhr rht rkc rke rkk rko rkt roc roe roh rok roo ror rot rrc rrh rrk rrr rrt rtc rte rtk rto rtr rtt tcc tce tch tck tco tcr tct te- tec tee teh tek teo ter tet th- thc the thh thk tho thr tht tkc tke tkk tko tkr tkt to- toc toe toh tok too tor tot trc tre trh trk tro trr trt ttc tte tth ttk tto ttr ttt