-er a-a aaa aad aae aap aar ad- ada add ade adp adr aea aed aee aep aer ap- apa apd ape app apr ar- ara ard are arp arr daa dad dae dap dar dda ddd dde ddp ddr de- dea ded dee dep der dpa dpd dpe dpp dpr dra drd dre drp drr eaa ead eae eap ear ed- eda edd ede edp edr eea eed eee eep eer ep- epa epd epe epp epr era erd ere erp err p-p paa pad pae pap par pda pdd pde pdp pdr pea ped pee pep per ppa ppd ppe ppp ppr pra prd pre prp prr ra- raa rad rae rap rar rda rdd rde rdp rdr re- rea red ree rep rer rpa rpd rpe rpp rpr rra rrd rrp rrr