-er a-a aaa aad aae aak aar ad- ada add ade adk adr aea aed aee aek aer aka akd ake akk akr ar- ara ard are ark arr daa dad dae dak dar dda ddd dde ddk ddr de- dea ded dee dek der dka dke dkk dkr dra drd dre drk drr eaa ead eae eak ear ed- eda edd ede edk edr eea eed eee eek eer eka ekd eke ekr era erd ere erk err ka- kaa kad kae kak kar kda kde kdk kdr ke- kea ked kee kek ker kke kkk kkr kra krd krk krr ra- raa rad rae rak rar rda rdd rde rdr re- rea red ree rek rer rke rkk rra rrd rrk rrr