-er -th c-- ccc cce cch cck cco ccr ccs cct ce- cec cee ceh cek ceo cer ces cet ch- chc che chh chk cho chr chs cht ckc ckh cko cks ckt co- coc coe coh cok coo cor cos cot crc cre crh crk cro crr crs crt csc cse csh csk cso csr css cst ctc cte cth ctk cto ctr cts ctt ec- ecc ece ech eck eco ecr ecs ect eec eee eek eeo eer ees eet ehc ehe ehh eho ehr ehs eht ekc eke ekh eko ekr eks ekt eo- eoc eoe eoh eok eoo eor eos eot erc ere erh erk ero err ers ert es- esc ese esh esk eso esr ess est etc ete eth etk eto etr ets ett hcc hce hch hck hco hcr hcs hct he- hec hee heh hek heo her hes het hhc hhe hhh hhk hho hhr hhs hht hkh hkk hko hkr hks hkt hoc hoe hoh hok hoo hor hos hot hr- hrc hre hrh hrk hro hrr hrs hrt hsc hse hsh hsk hsr hss hst htc hte hth htk hto htr hts htt k-t kcc kce kch kck kcr kcs kct ke- kec kee keh kek keo ker kes ket khe khh khk kho khr khs kkc kke kkh kkk kkr kks kkt koc koe koh kok koo kor kos kot krc krk kro krr krs krt ksc kse ksh ksk kso ksr kss kst ktc kte kth ktk kto ktr kts ktt oc- occ och ock oco ocr ocs oct oec oee oeh oeo oer oes oet ohc ohe ohh oho ohr ohs oht okc oke okk oko okr oks oo- ooc ooh ook ooo oor oos oot or- orc ore orh ork oro orr ors ort os- osc ose osh osk oso osr oss ost ot- otc ote oth otk oto otr ots ott rcc rce rch rco rcr rcs rct re- rec ree reh rek reo rer res ret rh- rhc rhe rhh rho rhr rhs rht rkc rke rkk rko rks rkt roc roe roh rok roo ror ros rot rrc rrh rrk rrr rrs rrt rsc rse rsh rsk rso rsr rss rst rtc rte rtk rto rtr rts rtt scc sce sch sck sco scr scs sct se- sec see seh sek seo ser ses set sh- shc she shh shk sho shr shs sht sk- skc ske skh skk sko skr sks skt soc soe soh sok soo sor sos sot sr- src sre srh srk sro srr srs srt ss- ssc sse ssh ssk sso ssr sss sst stc ste sth stk sto str sts stt tcc tce tch tck tco tcr tcs tct te- tec tee teh tek teo ter tes tet th- thc the thh thk tho thr ths tht tkc tke tkk tko tkr tks tkt to- toc toe toh tok too tor tos tot trc tre trh trk tro trr trs trt tsc tse tsh tsk tso tsr tss tst ttc tte tth ttk tto ttr tts ttt