-er c-- ccc ccd cce cch cck ccr cdc cdd cde cdh cdk cdr ce- cec ced cee ceh cek cer ch- chc chd che chh chk chr ckc ckd ckh crc crd cre crh crk crr dcc dcd dce dck dcr ddc ddd dde ddh ddk ddr de- dec ded dee deh dek der dh- dhc dhd dhe dhh dhk dhr dkc dke dkk dkr drc drd dre drk drr ec- ecc ecd ece ech eck ecr ed- edc edd ede edh edk edr eec eed eee eek eer ehc ehd ehe ehh ehr ekc ekd eke ekh ekr erc erd ere erh erk err hcc hcd hce hch hck hcr hdc hdd hde hdh hdk hdr he- hec hed hee heh hek her hhc hhd hhe hhh hhk hhr hkd hkh hkk hkr hr- hrc hrd hre hrh hrk hrr kcc kcd kce kch kck kcr kdc kde kdh kdk kdr ke- kec ked kee keh kek ker khe khh khk khr kkc kke kkh kkk kkr krc krd krk krr rcc rcd rce rch rcr rdc rdd rde rdh rdr re- rec red ree reh rek rer rh- rhc rhd rhe rhh rhr rkc rke rkk rrc rrd rrh rrk rrr