-er c-- ccc ccd cce cch cck cco ccr cdc cdd cde cdh cdk cdo cdr ce- cec ced cee ceh cek ceo cer ch- chc chd che chh chk cho chr ckc ckd ckh cko co- coc cod coe coh cok coo cor crc crd cre crh crk cro crr dcc dcd dce dck dco dcr ddc ddd dde ddh ddk ddo ddr de- dec ded dee deh dek deo der dh- dhc dhd dhe dhh dhk dho dhr dkc dke dkk dko dkr doc dod doe doh dok doo dor drc drd dre drk dro drr ec- ecc ecd ece ech eck eco ecr ed- edc edd ede edh edk edo edr eec eed eee eek eeo eer ehc ehd ehe ehh eho ehr ekc ekd eke ekh eko ekr eo- eoc eod eoe eoh eok eoo eor erc erd ere erh erk ero err hcc hcd hce hch hck hco hcr hdc hdd hde hdh hdk hdo hdr he- hec hed hee heh hek heo her hhc hhd hhe hhh hhk hho hhr hkd hkh hkk hko hkr hoc hod hoe hoh hok hoo hor hr- hrc hrd hre hrh hrk hro hrr kcc kcd kce kch kck kcr kdc kde kdh kdk kdo kdr ke- kec ked kee keh kek keo ker khe khh khk kho khr kkc kke kkh kkk kkr koc kod koe koh kok koo kor krc krd krk kro krr oc- occ ocd och ock oco ocr odc odd ode odh odo odr oec oed oee oeh oeo oer ohc ohd ohe ohh oho ohr okc okd oke okk oko okr oo- ooc ood ooh ook ooo oor or- orc ord ore orh ork oro orr rcc rcd rce rch rco rcr rdc rdd rde rdh rdo rdr re- rec red ree reh rek reo rer rh- rhc rhd rhe rhh rho rhr rkc rke rkk rko roc rod roe roh rok roo ror rrc rrd rrh rrk rrr