-er -ic c-- ccc cce ccf cci cck cco ccr ccs cct ce- cec cee cef cei cek ceo cer ces cet cfc cfe cff cfi cfk cfo cfr cfs cft ci- cic cie cif cii cik cio cir cis cit ckc cki cko cks ckt co- coc coe cof coi cok coo cor cos cot crc cre crf cri crk cro crr crs crt csc cse csf csi csk cso csr css cst ctc cte ctf cti ctk cto ctr cts ctt ec- ecc ece ecf eci eck eco ecr ecs ect eec eee eef eek eeo eer ees eet ef- efc efe eff efi efo efr efs eft eic eie eif eii eik eio eir eis eit ekc eke ekf eki eko ekr eks ekt eo- eoc eoe eof eoi eok eoo eor eos eot erc ere erf eri erk ero err ers ert es- esc ese esf esi esk eso esr ess est etc ete etf eti etk eto etr ets ett fcc fce fcf fci fck fco fcr fcs fct fec fee fef fei fek feo fer fes fet ffc ffe fff ffi ffk ffo ffr ffs fft fic fie fif fii fik fir fis fit fkc fkf fki fkk fkt foc foe fof foi fok foo for fos fot frc fre frf fri frk fro frr frs frt fsc fse fsf fsi fsk fso fsr fss fst ftc fte ftf fti ftk fto ftr fts ftt i-f icc ice icf ici ick ico icr ics ict ie- iec iee ief iei iek ier ies iet ifc ife iff ifi ifo ifr ifs ift iic iie iif iii iio iir iis iit ikc ike ikf iki ikk iko ikr iks ikt io- ioc ioe iof ioi ioo ior ios iot ir- irc ire irf iri irk iro irr irs irt is- isc ise isf isi isk iso isr iss ist itc ite itf iti itk ito its itt k-t kcc kce kci kck kcr kcs kct ke- kec kee kef kei kek keo ker kes ket kfc kff kfi kfo kfs kic kie kif kii kik kio kir kis kit kkc kke kki kkk kkr kks kkt koc koe kof koi kok koo kor kos kot krc krf kri krk kro krr krs krt ksc kse ksf ksi ksk kso ksr kss kst ktc kte ktf ktk kto ktr kts ktt o-i oc- occ ocf oci ock oco ocr ocs oct oec oee oef oei oeo oer oes oet of- ofc ofe off ofi ofo ofr ofs oft oic oie oif oii oik oio oir ois oit okc oke oki okk oko okr oks oo- ooc oof ooi ook ooo oor oos oot or- orc ore orf ori ork oro orr ors ort os- osc ose osf osi osk oso osr oss ost ot- otc ote otf oti otk oto otr ots ott rcc rce rcf rci rco rcr rcs rct re- rec ree ref rei rek reo rer res ret rfc rfe rff rfi rfk rfo rfr rfs rft ric rie rif rii rik rio rir ris rit rkc rke rkf rkk rko rks rkt roc roe rof roi rok roo ror ros rot rrc rrf rri rrk rrr rrs rrt rsc rse rsf rsi rsk rso rsr rss rst rtc rte rtf rti rtk rto rtr rts rtt scc sce scf sci sck sco scr scs sct se- sec see sef sei sek seo ser ses set sfc sfe sff sfi sfk sfo sfr sfs sft sic sie sif sii sik sio sir sis sit sk- skc ske skf ski skk sko skr sks skt soc soe sof soi sok soo sor sos sot sr- src sre srf sri srk sro srr srs srt ss- ssc sse ssf ssi ssk sso ssr sss sst stc ste stf sti stk sto str sts stt tcc tce tcf tci tck tco tcr tcs tct te- tec tee tef tei tek teo ter tes tet tfc tfe tff tfi tfk tfo tfr tfs tft tic tie tif tii tik tio tir tis tit tkc tke tkk tko tkr tks tkt to- toc toe tof toi tok too tor tos tot trc tre trf tri trk tro trr trs trt tsc tse tsf tsi tsk tso tsr tss tst ttc tte ttf tti ttk tto ttr tts ttt