-er ddd dde ddg ddp ddr de- ded dee deg dep der dgd dge dgg dgp dgr dpd dpe dpg dpp dpr drd dre drg drp drr ed- edd ede edg edp edr eed eee eeg eep eer egd ege egg egp egr ep- epd epe epg epp epr erd ere erg erp err g-d g-p gdd gde gdp gdr ge- ged gee geg gep ger ggd ggg ggp ggr gpd gpe gpg gpp gpr grd gre grg grp grr p-p pdd pde pdg pdp pdr ped pee peg pep per pgd pge pgg pgp pgr ppd ppe ppg ppp ppr prd pre prg prp prr rdd rde rdg rdp rdr re- red ree reg rep rer rgd rge rgg rgp rgr rpd rpe rpg rpp rpr rrd rrg rrp rrr