-er a-a a-c aaa aac aad aae aap aar aav ac- aca acc acd ace acp acr acv ad- ada adc add ade adp adr adv aea aec aed aee aep aer aev ap- apa apc apd ape app apr apv ar- ara arc ard are arp arr arv av- ava avc avd ave avp avr c-- caa cac cad cae cap car cav cca ccc ccd cce ccp ccr ccv cda cdc cdd cde cdp cdr cdv ce- cea cec ced cee cep cer cev cpa cpc cpd cpe cpp cpr cpv cra crc crd cre crp crr crv cva cvc cvd cve cvp cvr cvv daa dac dad dae dap dar dav dca dcc dcd dce dcp dcr dcv dda ddc ddd dde ddp ddr de- dea dec ded dee dep der dev dpa dpc dpd dpe dpp dpr dpv dra drc drd dre drp drr drv dva dvc dvd dve dvp dvr eaa eac ead eae eap ear eav ec- eca ecc ecd ece ecr ecv ed- eda edc edd ede edp edr eea eec eed eee eep eer eev ep- epa epc epd epe epp epr era erc erd ere erp err erv eva evc evd eve evp evr evv p-p paa pac pad pae pap par pav pca pcc pcd pce pcp pcr pcv pda pdc pdd pde pdp pdr pdv pea pec ped pee pep per pev ppa ppc ppd ppe ppp ppr ppv pra prc prd pre prp prr prv pva pvc pvd pve pvp pvr pvv ra- raa rac rad rae rap rar rav rca rcc rcd rce rcp rcr rcv rda rdc rdd rde rdp rdr rdv re- rea rec red ree rep rer rev rpa rpc rpd rpe rpp rpr rpv rra rrc rrd rrp rrr rva rvc rvd rve rvp rvr rvv v-a v-e vaa vac vad vae vap var vav vca vcc vcd vce vcp vcr vdc vdd vde vdp vdr vdv vea vec ved vee vep ver vpa vpc vpd vpe vpp vpr vra vrc vrd vre vrp vrr vva vvc vvr vvv