-er -ic c-- ccc ccd cce cci cck cco ccr cct cdc cdd cde cdi cdk cdo cdr cdt ce- cec ced cee cei cek ceo cer cet ci- cic cid cie cii cik cio cir cit ckc ckd cki cko ckt co- coc cod coe coi cok coo cor cot crc crd cre cri crk cro crr crt ctc ctd cte cti ctk cto ctr ctt dcc dcd dce dci dck dco dcr dct ddc ddd dde ddi ddk ddo ddr ddt de- dec ded dee dei dek deo der det di- dic did die dii dik dio dir dit dkc dke dki dkk dko dkr dkt doc dod doe doi dok doo dor dot drc drd dre dri drk dro drr drt dtc dtd dte dti dtk dto dtr dtt ec- ecc ecd ece eci eck eco ecr ect ed- edc edd ede edi edk edo edr edt eec eed eee eek eeo eer eet eic eid eie eii eik eio eir eit ekc ekd eke eki eko ekr ekt eo- eoc eod eoe eoi eok eoo eor eot erc erd ere eri erk ero err ert etc etd ete eti etk eto etr ett i-d icc icd ice ici ick ico icr ict idc idd ide idi idk ido idr idt ie- iec ied iee iei iek ier iet iic iid iie iii iio iir iit ikc ike iki ikk iko ikr ikt io- ioc iod ioe ioi ioo ior iot ir- irc ird ire iri irk iro irr irt itc itd ite iti itk ito itt k-t kcc kcd kce kci kck kcr kct kdc kde kdk kdo kdr kdt ke- kec ked kee kei kek keo ker ket kic kid kie kii kik kio kir kit kkc kke kki kkk kkr kkt koc kod koe koi kok koo kor kot krc krd kri krk kro krr krt ktc kte ktk kto ktr ktt o-i oc- occ ocd oci ock oco ocr oct odc odd ode odi odo odr odt oec oed oee oei oeo oer oet oic oid oie oii oik oio oir oit okc okd oke oki okk oko okr oo- ooc ood ooi ook ooo oor oot or- orc ord ore ori ork oro orr ort ot- otc otd ote oti otk oto otr ott rcc rcd rce rci rco rcr rct rdc rdd rde rdi rdo rdr rdt re- rec red ree rei rek reo rer ret ric rid rie rii rik rio rir rit rkc rke rkk rko rkt roc rod roe roi rok roo ror rot rrc rrd rri rrk rrr rrt rtc rtd rte rti rtk rto rtr rtt tcc tcd tce tci tck tco tcr tct tdc tdd tde tdi tdk tdo tdr tdt te- tec ted tee tei tek teo ter tet tic tid tie tii tik tio tir tit tkc tke tkk tko tkr tkt to- toc tod toe toi tok too tor tot trc trd tre tri trk tro trr trt ttc ttd tte tti ttk tto ttr ttt