-er a-a a-z aaa aad aae aak aar aaz ad- ada add ade adk adr adz aea aed aee aek aer aez aka akd ake akk akr ar- ara ard are ark arr arz az- aza azd aze azz daa dad dae dak dar daz dda ddd dde ddk ddr ddz de- dea ded dee dek der dez dka dke dkk dkr dra drd dre drk drr drz dza dzd dze dzr eaa ead eae eak ear eaz ed- eda edd ede edk edr eea eed eee eek eer eka ekd eke ekr era erd ere erk err erz eze ezr ezz k-z ka- kaa kad kae kak kar kaz kda kde kdk kdr ke- kea ked kee kek ker kez kke kkk kkr kra krd krk krr ra- raa rad rae rak rar raz rda rdd rde rdr re- rea red ree rek rer rez rke rkk rkz rra rrd rrk rrr rza rze zaa zad zak zar zaz zea zed zee zek zer zez zka zzr zzz