-er a-a a-c aaa aac aae aaj aak aao aar ac- aca acc ace acj ack aco acr aea aec aee aej aek aeo aer aja ajc aje ajj ajk ajo ajr aka akc ake akj akk ako akr aoa aoc aoe aoj aok aoo aor ar- ara arc are arj ark aro arr c-- c-j caa cac cae caj cak cao car cca ccc cce ccj cck cco ccr ce- cea cec cee cej cek ceo cer cja cjc cjk cjr cka ckc cko co- coa coc coe coj cok coo cor cra crc cre crj crk cro crr eaa eac eae eaj eak eao ear ec- eca ecc ece ecj eck eco ecr eea eec eee eek eeo eer eja ejc ejo eka ekc eke eko ekr eo- eoa eoc eoe eok eoo eor era erc ere erk ero err jaa jac jae jaj jak jao jar jca jcc jce jck jco jcr jea jec jee jej jek jeo jer jja jjc jjj jjk jjr jka jkk jko jkr joa joc joe joj jok joo jor jra jrc jrk jro jrr ka- kaa kac kae kaj kak kao kar kca kcc kce kck kcr ke- kea kec kee kek keo ker kjc kje kjr kkc kke kkk kkr koa koc koe kok koo kor kra krc krk kro krr oaa oac oae oaj oak oao oar oc- oca occ ocj ock oco ocr oea oec oee oeo oer oja ojc oje ojo oka okc oke okj okk oko okr oo- ooa ooc ook ooo oor or- ora orc ore ork oro orr ra- raa rac rae raj rak rao rar rca rcc rce rcj rco rcr re- rea rec ree rek reo rer rja rjc rjk rjr rkc rke rkk rko roa roc roe roj rok roo ror rra rrc rrk rrr