-er a-a a-c aaa aac aad aae aah aak aao aar ac- aca acc acd ace ach ack aco acr ad- ada adc add ade adh adk ado adr aea aec aed aee aeh aek aeo aer aha ahc ahd ahe ahh ahk aho ahr aka akc akd ake akh akk ako akr aoa aoc aod aoe aoh aok aoo aor ar- ara arc ard are arh ark aro arr c-- caa cac cad cae cah cak cao car cca ccc ccd cce cch cck cco ccr cda cdc cdd cde cdh cdk cdo cdr ce- cea cec ced cee ceh cek ceo cer ch- cha chc chd che chh chk cho chr cka ckc ckd ckh cko co- coa coc cod coe coh cok coo cor cra crc crd cre crh crk cro crr daa dac dad dae dah dak dao dar dca dcc dcd dce dck dco dcr dda ddc ddd dde ddh ddk ddo ddr de- dea dec ded dee deh dek deo der dh- dha dhc dhd dhe dhh dhk dho dhr dka dkc dke dkk dko dkr doa doc dod doe doh dok doo dor dra drc drd dre drk dro drr eaa eac ead eae eah eak eao ear ec- eca ecc ecd ece ech eck eco ecr ed- eda edc edd ede edh edk edo edr eea eec eed eee eek eeo eer eha ehc ehd ehe ehh eho ehr eka ekc ekd eke ekh eko ekr eo- eoa eoc eod eoe eoh eok eoo eor era erc erd ere erh erk ero err haa hac had hae hah hak hao har hca hcc hcd hce hch hck hco hcr hda hdc hdd hde hdh hdk hdo hdr he- hea hec hed hee heh hek heo her hha hhc hhd hhe hhh hhk hho hhr hka hkd hkh hkk hko hkr hoa hoc hod hoe hoh hok hoo hor hr- hra hrc hrd hre hrh hrk hro hrr ka- kaa kac kad kae kah kak kao kar kca kcc kcd kce kch kck kcr kda kdc kde kdh kdk kdo kdr ke- kea kec ked kee keh kek keo ker kha khe khh khk kho khr kkc kke kkh kkk kkr koa koc kod koe koh kok koo kor kra krc krd krk kro krr oaa oac oad oae oah oak oao oar oc- oca occ ocd och ock oco ocr oda odc odd ode odh odo odr oea oec oed oee oeh oeo oer oha ohc ohd ohe ohh oho ohr oka okc okd oke okk oko okr oo- ooa ooc ood ooh ook ooo oor or- ora orc ord ore orh ork oro orr ra- raa rac rad rae rah rak rao rar rca rcc rcd rce rch rco rcr rda rdc rdd rde rdh rdo rdr re- rea rec red ree reh rek reo rer rh- rha rhc rhd rhe rhh rho rhr rkc rke rkk rko roa roc rod roe roh rok roo ror rra rrc rrd rrh rrk rrr