-er a-a a-c aaa aac aae aah aak aao aar ac- aca acc ace ach ack aco acr aea aec aee aeh aek aeo aer aha ahc ahe ahh ahk aho ahr aka akc ake akh akk ako akr aoa aoc aoe aoh aok aoo aor ar- ara arc are arh ark aro arr c-- caa cac cae cah cak cao car cca ccc cce cch cck cco ccr ce- cea cec cee ceh cek ceo cer ch- cha chc che chh chk cho chr cka ckc ckh cko co- coa coc coe coh cok coo cor cra crc cre crh crk cro crr eaa eac eae eah eak eao ear ec- eca ecc ece ech eck eco ecr eea eec eee eek eeo eer eha ehc ehe ehh eho ehr eka ekc eke ekh eko ekr eo- eoa eoc eoe eoh eok eoo eor era erc ere erh erk ero err haa hac hae hah hak hao har hca hcc hce hch hck hco hcr he- hea hec hee heh hek heo her hha hhc hhe hhh hhk hho hhr hka hkh hkk hko hkr hoa hoc hoe hoh hok hoo hor hr- hra hrc hre hrh hrk hro hrr ka- kaa kac kae kah kak kao kar kca kcc kce kch kck kcr ke- kea kec kee keh kek keo ker kha khe khh khk kho khr kkc kke kkh kkk kkr koa koc koe koh kok koo kor kra krc krk kro krr oaa oac oae oah oak oao oar oc- oca occ och ock oco ocr oea oec oee oeh oeo oer oha ohc ohe ohh oho ohr oka okc oke okk oko okr oo- ooa ooc ooh ook ooo oor or- ora orc ore orh ork oro orr ra- raa rac rae rah rak rao rar rca rcc rce rch rco rcr re- rea rec ree reh rek reo rer rh- rha rhc rhe rhh rho rhr rkc rke rkk rko roa roc roe roh rok roo ror rra rrc rrh rrk rrr