-er a-a a-c aaa aac aad aae aak aao aar aav ac- aca acc acd ace ack aco acr acv ad- ada adc add ade adk ado adr adv aea aec aed aee aek aeo aer aev aka akc akd ake akk ako akr akv aoa aoc aod aoe aok aoo aor aov ar- ara arc ard are ark aro arr arv av- ava avc avd ave avk avo avr c-- caa cac cad cae cak cao car cav cca ccc ccd cce cck cco ccr ccv cda cdc cdd cde cdk cdo cdr cdv ce- cea cec ced cee cek ceo cer cev cka ckc ckd cko co- coa coc cod coe cok coo cor cov cra crc crd cre crk cro crr crv cva cvc cvd cve cvk cvo cvr cvv daa dac dad dae dak dao dar dav dca dcc dcd dce dck dco dcr dcv dda ddc ddd dde ddk ddo ddr de- dea dec ded dee dek deo der dev dka dkc dke dkk dko dkr doa doc dod doe dok doo dor dov dra drc drd dre drk dro drr drv dva dvc dvd dve dvk dvr eaa eac ead eae eak eao ear eav ec- eca ecc ecd ece eck eco ecr ecv ed- eda edc edd ede edk edo edr eea eec eed eee eek eeo eer eev eka ekc ekd eke eko ekr ekv eo- eoa eoc eod eoe eok eoo eor era erc erd ere erk ero err erv eva evc evd eve evo evr evv ka- kaa kac kad kae kak kao kar kav kca kcc kcd kce kck kcr kda kdc kde kdk kdo kdr ke- kea kec ked kee kek keo ker kev kkc kke kkk kkr kkv koa koc kod koe kok koo kor kra krc krd krk kro krr krv kva kvk kvo kvr kvv oaa oac oad oae oak oao oar oav oc- oca occ ocd ock oco ocr ocv oda odc odd ode odo odr odv oea oec oed oee oeo oer oka okc okd oke okk oko okr oo- ooa ooc ood ook ooo oor oov or- ora orc ord ore ork oro orr orv ov- ova ovc ovd ove ovo ovv ra- raa rac rad rae rak rao rar rav rca rcc rcd rce rco rcr rcv rda rdc rdd rde rdo rdr rdv re- rea rec red ree rek reo rer rev rkc rke rkk rko rkv roa roc rod roe rok roo ror rov rra rrc rrd rrk rrr rva rvc rvd rve rvo rvr rvv v-a v-e vaa vac vad vae vak vao var vav vca vcc vcd vce vco vcr vdc vdd vde vdk vdo vdr vdv vea vec ved vee vek veo ver vka voa voc vod voe vok voo vor vov vra vrc vrd vre vrk vrr vva vvc vvo vvr vvv