-er -ic c-- ccc cce ccf cci cck cco ccr cct ce- cec cee cef cei cek ceo cer cet cfc cfe cff cfi cfk cfo cfr cft ci- cic cie cif cii cik cio cir cit ckc cki cko ckt co- coc coe cof coi cok coo cor cot crc cre crf cri crk cro crr crt ctc cte ctf cti ctk cto ctr ctt ec- ecc ece ecf eci eck eco ecr ect eec eee eef eek eeo eer eet ef- efc efe eff efi efo efr eft eic eie eif eii eik eio eir eit ekc eke ekf eki eko ekr ekt eo- eoc eoe eof eoi eok eoo eor eot erc ere erf eri erk ero err ert etc ete etf eti etk eto etr ett fcc fce fcf fci fck fco fcr fct fec fee fef fei fek feo fer fet ffc ffe fff ffi ffk ffo ffr fft fic fie fif fii fik fir fit fkc fkf fki fkk fkt foc foe fof foi fok foo for fot frc fre frf fri frk fro frr frt ftc fte ftf fti ftk fto ftr ftt i-f icc ice icf ici ick ico icr ict ie- iec iee ief iei iek ier iet ifc ife iff ifi ifo ifr ift iic iie iif iii iio iir iit ikc ike ikf iki ikk iko ikr ikt io- ioc ioe iof ioi ioo ior iot ir- irc ire irf iri irk iro irr irt itc ite itf iti itk ito itt k-t kcc kce kci kck kcr kct ke- kec kee kef kei kek keo ker ket kfc kff kfi kfo kic kie kif kii kik kio kir kit kkc kke kki kkk kkr kkt koc koe kof koi kok koo kor kot krc krf kri krk kro krr krt ktc kte ktf ktk kto ktr ktt o-i oc- occ ocf oci ock oco ocr oct oec oee oef oei oeo oer oet of- ofc ofe off ofi ofo ofr oft oic oie oif oii oik oio oir oit okc oke oki okk oko okr oo- ooc oof ooi ook ooo oor oot or- orc ore orf ori ork oro orr ort ot- otc ote otf oti otk oto otr ott rcc rce rcf rci rco rcr rct re- rec ree ref rei rek reo rer ret rfc rfe rff rfi rfk rfo rfr rft ric rie rif rii rik rio rir rit rkc rke rkf rkk rko rkt roc roe rof roi rok roo ror rot rrc rrf rri rrk rrr rrt rtc rte rtf rti rtk rto rtr rtt tcc tce tcf tci tck tco tcr tct te- tec tee tef tei tek teo ter tet tfc tfe tff tfi tfk tfo tfr tft tic tie tif tii tik tio tir tit tkc tke tkk tko tkr tkt to- toc toe tof toi tok too tor tot trc tre trf tri trk tro trr trt ttc tte ttf tti ttk tto ttr ttt