-er a-a a-c aaa aac aae aaf aaj aak aan aao aar ac- aca acc ace acf acj ack acn aco acr aea aec aee aef aej aek aen aeo aer af- afa afc afe aff afj afk afn afo afr aja ajc aje ajf ajj ajk ajn ajo ajr aka akc ake akj akk akn ako akr an- ana anc ane anf anj ank ann ano anr aoa aoc aoe aof aoj aok aon aoo aor ar- ara arc are arf arj ark arn aro arr c-- c-j caa cac cae caf caj cak can cao car cca ccc cce ccf ccj cck ccn cco ccr ce- cea cec cee cef cej cek cen ceo cer cfa cfc cfe cff cfk cfn cfo cfr cja cjc cjf cjk cjr cka ckc cko cn- cna cnc cne cnf cnj cnn cno cnr co- coa coc coe cof coj cok con coo cor cra crc cre crf crj crk crn cro crr eaa eac eae eaf eaj eak ean eao ear ec- eca ecc ece ecf ecj eck ecn eco ecr eea eec eee eef eek een eeo eer ef- efa efc efe eff efo efr eja ejc ejf ejo eka ekc eke ekf eko ekr en- ena enc ene enf enk enn eno enr eo- eoa eoc eoe eof eok eon eoo eor era erc ere erf erk ern ero err faa fac fae faf faj fak fan fao far fca fcc fce fcf fcj fck fcn fco fcr fea fec fee fef fek fen feo fer ffa ffc ffe fff ffk ffn ffo ffr fja fjc fka fkc fkf fkj fkk fna fnc fne fnf fnj fnk fnn fnr foa foc foe fof fok fon foo for fra frc fre frf frj frk frn fro frr jaa jac jae jaf jaj jak jan jao jar jca jcc jce jcf jck jco jcr jea jec jee jef jej jek jen jeo jer jfa jfc jfe jff jfj jfk jfo jfr jja jjc jjf jjj jjk jjr jka jkk jkn jko jkr jna jnc jne jnf jnj jnn jno jnr joa joc joe jof joj jok jon joo jor jra jrc jrf jrk jrn jro jrr ka- kaa kac kae kaf kaj kak kan kao kar kca kcc kce kck kcn kcr ke- kea kec kee kef kek ken keo ker kfa kfc kff kfo kjc kje kjr kkc kke kkk kkn kkr kn- kna knc kne knf knk knn kno knr koa koc koe kof kok kon koo kor kra krc krf krk krn kro krr naa nac nae naf naj nak nan nao nar nca ncc nce ncf nck ncn nco ncr ne- nea nec nee nef nej nek nen neo ner nfa nfc nfe nff nfk nfn nfo nfr nja njc nje njf njk njn nka nkc nke nkf nkj nkk nkn nko nkr nna nnc nne nnf nnk nnn nno no- noa noc noe nof noj nok non noo nor nra nrc nre nrf nrj nrk nrn nro nrr oaa oac oae oaf oaj oak oan oao oar oc- oca occ ocf ocj ock ocn oco ocr oea oec oee oef oen oeo oer of- ofa ofc ofe off ofn ofo ofr oja ojc oje ojo oka okc oke okj okk oko okr on- ona onc one onf onj onk onn ono onr oo- ooa ooc oof ook oon ooo oor or- ora orc ore orf ork orn oro orr ra- raa rac rae raf raj rak ran rao rar rca rcc rce rcf rcj rcn rco rcr re- rea rec ree ref rek ren reo rer rfa rfc rfe rff rfj rfk rfn rfo rfr rja rjc rjf rjk rjr rkc rke rkf rkk rko rna rnc rnn rno rnr roa roc roe rof roj rok ron roo ror rra rrc rrf rrk rrn rrr