-er c-- ccc ccd cce cch cck ccn cco ccr cdc cdd cde cdh cdk cdn cdo cdr ce- cec ced cee ceh cek cen ceo cer ch- chc chd che chh chk chn cho chr ckc ckd ckh cko cn- cnc cnd cne cnh cnn cno cnr co- coc cod coe coh cok con coo cor crc crd cre crh crk crn cro crr dcc dcd dce dck dcn dco dcr ddc ddd dde ddh ddk ddn ddo ddr de- dec ded dee deh dek den deo der dh- dhc dhd dhe dhh dhk dho dhr dkc dke dkk dko dkr dnc dnd dne dnh dnk dnn dno dnr doc dod doe doh dok don doo dor drc drd dre drk drn dro drr ec- ecc ecd ece ech eck ecn eco ecr ed- edc edd ede edh edk edn edo edr eec eed eee eek een eeo eer ehc ehd ehe ehh ehn eho ehr ekc ekd eke ekh eko ekr en- enc end ene enh enk enn eno enr eo- eoc eod eoe eoh eok eon eoo eor erc erd ere erh erk ern ero err hcc hcd hce hch hck hcn hco hcr hdc hdd hde hdh hdk hdn hdo hdr he- hec hed hee heh hek hen heo her hhc hhd hhe hhh hhk hhn hho hhr hkd hkh hkk hkn hko hkr hnc hnd hne hnh hnk hnn hno hoc hod hoe hoh hok hon hoo hor hr- hrc hrd hre hrh hrk hrn hro hrr kcc kcd kce kch kck kcn kcr kdc kde kdh kdk kdo kdr ke- kec ked kee keh kek ken keo ker khe khh khk khn kho khr kkc kke kkh kkk kkn kkr kn- knc knd kne knk knn kno knr koc kod koe koh kok kon koo kor krc krd krk krn kro krr ncc ncd nce nch nck ncn nco ncr ndc ndd nde ndh ndk ndn ndo ndr ne- nec ned nee neh nek nen neo ner nhc nhd nhe nhh nhk nhn nhr nkc nke nkk nkn nko nkr nnc nne nnh nnk nnn nno no- noc nod noe noh nok non noo nor nrc nrd nre nrk nrn nro nrr oc- occ ocd och ock ocn oco ocr odc odd ode odh odn odo odr oec oed oee oeh oen oeo oer ohc ohd ohe ohh ohn oho ohr okc okd oke okk oko okr on- onc ond one onh onk onn ono onr oo- ooc ood ooh ook oon ooo oor or- orc ord ore orh ork orn oro orr rcc rcd rce rch rcn rco rcr rdc rdd rde rdh rdn rdo rdr re- rec red ree reh rek ren reo rer rh- rhc rhd rhe rhh rhn rho rhr rkc rke rkk rko rnc rnd rnh rnn rno rnr roc rod roe roh rok ron roo ror rrc rrd rrh rrk rrn rrr