-er a-a a-c aaa aac aae aaj aak aao aar aav ac- aca acc ace acj ack aco acr acv aea aec aee aej aek aeo aer aev aja ajc aje ajj ajk ajo ajr aka akc ake akj akk ako akr akv aoa aoc aoe aoj aok aoo aor aov ar- ara arc are arj ark aro arr arv av- ava avc ave avk avo avr c-- c-j caa cac cae caj cak cao car cav cca ccc cce ccj cck cco ccr ccv ce- cea cec cee cej cek ceo cer cev cja cjc cjk cjr cka ckc cko co- coa coc coe coj cok coo cor cov cra crc cre crj crk cro crr crv cva cvc cve cvk cvo cvr cvv eaa eac eae eaj eak eao ear eav ec- eca ecc ece ecj eck eco ecr ecv eea eec eee eek eeo eer eev eja ejc ejo eka ekc eke eko ekr ekv eo- eoa eoc eoe eok eoo eor era erc ere erk ero err erv eva evc eve evo evr evv jaa jac jae jaj jak jao jar jav jca jcc jce jck jco jcr jea jec jee jej jek jeo jer jja jjc jjj jjk jjr jka jkk jko jkr jkv joa joc joe joj jok joo jor jra jrc jrk jro jrr jvc ka- kaa kac kae kaj kak kao kar kav kca kcc kce kck kcr ke- kea kec kee kek keo ker kev kjc kje kjr kkc kke kkk kkr kkv koa koc koe kok koo kor kra krc krk kro krr krv kva kvk kvo kvr kvv oaa oac oae oaj oak oao oar oav oc- oca occ ocj ock oco ocr ocv oea oec oee oeo oer oja ojc oje ojo oka okc oke okj okk oko okr oo- ooa ooc ook ooo oor oov or- ora orc ore ork oro orr orv ov- ova ovc ove ovo ovv ra- raa rac rae raj rak rao rar rav rca rcc rce rcj rco rcr rcv re- rea rec ree rek reo rer rev rja rjc rjk rjr rkc rke rkk rko rkv roa roc roe roj rok roo ror rov rra rrc rrk rrr rva rvc rve rvo rvr rvv v-a v-e vaa vac vae vaj vak vao var vav vca vcc vce vco vcr vea vec vee vek veo ver vja vka voa voc voe vok voo vor vov vra vrc vre vrk vrr vva vvc vvo vvr vvv