-er -ic c-- ccc cce cci cck cco ccr cct ce- cec cee cei cek ceo cer cet ci- cic cie cii cik cio cir cit ckc cki cko ckt co- coc coe coi cok coo cor cot crc cre cri crk cro crr crt ctc cte cti ctk cto ctr ctt ec- ecc ece eci eck eco ecr ect eec eee eek eeo eer eet eic eie eii eik eio eir eit ekc eke eki eko ekr ekt eo- eoc eoe eoi eok eoo eor eot erc ere eri erk ero err ert etc ete eti etk eto etr ett icc ice ici ick ico icr ict ie- iec iee iei iek ier iet iic iie iii iio iir iit ikc ike iki ikk iko ikr ikt io- ioc ioe ioi ioo ior iot ir- irc ire iri irk iro irr irt itc ite iti itk ito itt k-t kcc kce kci kck kcr kct ke- kec kee kei kek keo ker ket kic kie kii kik kio kir kit kkc kke kki kkk kkr kkt koc koe koi kok koo kor kot krc kri krk kro krr krt ktc kte ktk kto ktr ktt o-i oc- occ oci ock oco ocr oct oec oee oei oeo oer oet oic oie oii oik oio oir oit okc oke oki okk oko okr oo- ooc ooi ook ooo oor oot or- orc ore ori ork oro orr ort ot- otc ote oti otk oto otr ott rcc rce rci rco rcr rct re- rec ree rei rek reo rer ret ric rie rii rik rio rir rit rkc rke rkk rko rkt roc roe roi rok roo ror rot rrc rri rrk rrr rrt rtc rte rti rtk rto rtr rtt tcc tce tci tck tco tcr tct te- tec tee tei tek teo ter tet tic tie tii tik tio tir tit tkc tke tkk tko tkr tkt to- toc toe toi tok too tor tot trc tre tri trk tro trr trt ttc tte tti ttk tto ttr ttt