-er a-a a-c aaa aac aad aae aao aar aav ac- aca acc acd ace aco acr acv ad- ada adc add ade ado adr adv aea aec aed aee aeo aer aev aoa aoc aod aoe aoo aor aov ar- ara arc ard are aro arr arv av- ava avc avd ave avo avr c-- caa cac cad cae cao car cav cca ccc ccd cce cco ccr ccv cda cdc cdd cde cdo cdr cdv ce- cea cec ced cee ceo cer cev co- coa coc cod coe coo cor cov cra crc crd cre cro crr crv cva cvc cvd cve cvo cvr cvv daa dac dad dae dao dar dav dca dcc dcd dce dco dcr dcv dda ddc ddd dde ddo ddr de- dea dec ded dee deo der dev doa doc dod doe doo dor dov dra drc drd dre dro drr drv dva dvc dvd dve dvr eaa eac ead eae eao ear eav ec- eca ecc ecd ece eco ecr ecv ed- eda edc edd ede edo edr eea eec eed eee eeo eer eev eo- eoa eoc eod eoe eoo eor era erc erd ere ero err erv eva evc evd eve evo evr evv oaa oac oad oae oao oar oav oc- oca occ ocd oco ocr ocv oda odc odd ode odo odr odv oea oec oed oee oeo oer oo- ooa ooc ood ooo oor oov or- ora orc ord ore oro orr orv ov- ova ovc ovd ove ovo ovv ra- raa rac rad rae rao rar rav rca rcc rcd rce rco rcr rcv rda rdc rdd rde rdo rdr rdv re- rea rec red ree reo rer rev roa roc rod roe roo ror rov rra rrc rrd rrr rva rvc rvd rve rvo rvr rvv v-a v-e vaa vac vad vae vao var vav vca vcc vcd vce vco vcr vdc vdd vde vdo vdr vdv vea vec ved vee veo ver voa voc vod voe voo vor vov vra vrc vrd vre vrr vva vvc vvo vvr vvv