-er a-a a-c aaa aac aad aae aar aas aav ac- aca acc acd ace acr acs acv ad- ada adc add ade adr ads adv aea aec aed aee aer aes aev ar- ara arc ard are arr ars arv as- asa asc asd ase asr ass asv av- ava avc avd ave avr avs c-- caa cac cad cae car cas cav cca ccc ccd cce ccr ccs ccv cda cdc cdd cde cdr cds cdv ce- cea cec ced cee cer ces cev cra crc crd cre crr crs crv csa csc csd cse csr css csv cva cvc cvd cve cvr cvs cvv daa dac dad dae dar das dav dca dcc dcd dce dcr dcs dcv dda ddc ddd dde ddr dds de- dea dec ded dee der des dev dra drc drd dre drr drs drv dsa dsc dsd dse dsr dss dsv dva dvc dvd dve dvr dvs eaa eac ead eae ear eas eav ec- eca ecc ecd ece ecr ecs ecv ed- eda edc edd ede edr eds eea eec eed eee eer ees eev era erc erd ere err ers erv es- esa esc esd ese esr ess esv eva evc evd eve evr evs evv ra- raa rac rad rae rar ras rav rca rcc rcd rce rcr rcs rcv rda rdc rdd rde rdr rds rdv re- rea rec red ree rer res rev rra rrc rrd rrr rrs rsa rsc rsd rse rsr rss rsv rva rvc rvd rve rvr rvs rvv saa sac sad sae sar sas sav sca scc scd sce scr scs scv sda sdc sdd sde sdr sds sdv se- sea sec sed see ser ses sev sr- sra src srd sre srr srs srv ss- ssa ssc ssd sse ssr sss ssv sva svc svd sve svr svs svv v-a v-e vaa vac vad vae var vas vav vca vcc vcd vce vcr vcs vdc vdd vde vdr vds vdv vea vec ved vee ver ves vra vrc vrd vre vrr vrs vsa vsc vsd vse vsr vss vsv vva vvc vvr vvs vvv