-er a-a aaa aad aae aap aar aav ad- ada add ade adp adr adv aea aed aee aep aer aev ap- apa apd ape app apr apv ar- ara ard are arp arr arv av- ava avd ave avp avr daa dad dae dap dar dav dda ddd dde ddp ddr de- dea ded dee dep der dev dpa dpd dpe dpp dpr dpv dra drd dre drp drr drv dva dvd dve dvp dvr eaa ead eae eap ear eav ed- eda edd ede edp edr eea eed eee eep eer eev ep- epa epd epe epp epr era erd ere erp err erv eva evd eve evp evr evv p-p paa pad pae pap par pav pda pdd pde pdp pdr pdv pea ped pee pep per pev ppa ppd ppe ppp ppr ppv pra prd pre prp prr prv pva pvd pve pvp pvr pvv ra- raa rad rae rap rar rav rda rdd rde rdp rdr rdv re- rea red ree rep rer rev rpa rpd rpe rpp rpr rpv rra rrd rrp rrr rva rvd rve rvp rvr rvv v-a v-e vaa vad vae vap var vav vdd vde vdp vdr vdv vea ved vee vep ver vpa vpd vpe vpp vpr vra vrd vre vrp vrr vva vvr vvv