-er a-a aaa aad aae aak aao aar ad- ada add ade adk ado adr aea aed aee aek aeo aer aka akd ake akk ako akr aoa aod aoe aok aoo aor ar- ara ard are ark aro arr daa dad dae dak dao dar dda ddd dde ddk ddo ddr de- dea ded dee dek deo der dka dke dkk dko dkr doa dod doe dok doo dor dra drd dre drk dro drr eaa ead eae eak eao ear ed- eda edd ede edk edo edr eea eed eee eek eeo eer eka ekd eke eko ekr eo- eoa eod eoe eok eoo eor era erd ere erk ero err ka- kaa kad kae kak kao kar kda kde kdk kdo kdr ke- kea ked kee kek keo ker kke kkk kkr koa kod koe kok koo kor kra krd krk kro krr oaa oad oae oak oao oar oda odd ode odo odr oea oed oee oeo oer oka okd oke okk oko okr oo- ooa ood ook ooo oor or- ora ord ore ork oro orr ra- raa rad rae rak rao rar rda rdd rde rdo rdr re- rea red ree rek reo rer rke rkk rko roa rod roe rok roo ror rra rrd rrk rrr