-er a-a aaa aad aae aag aak aar ad- ada add ade adg adk adr aea aed aee aeg aek aer ag- aga agd age agg agk agr aka akd ake akg akk akr ar- ara ard are arg ark arr daa dad dae dag dak dar dda ddd dde ddg ddk ddr de- dea ded dee deg dek der dga dgd dge dgg dgk dgr dka dke dkg dkk dkr dra drd dre drg drk drr eaa ead eae eag eak ear ed- eda edd ede edg edk edr eea eed eee eeg eek eer ega egd ege egg egr eka ekd eke ekg ekr era erd ere erg erk err g-d gaa gad gae gag gak gar gda gdd gde gdk gdr ge- gea ged gee geg gek ger gga ggd ggg ggr gka gkd gra grd gre grg grk grr ka- kaa kad kae kag kak kar kda kde kdg kdk kdr ke- kea ked kee keg kek ker kga kgd kke kkk kkr kra krd krg krk krr ra- raa rad rae rag rak rar rda rdd rde rdg rdr re- rea red ree reg rek rer rga rgd rge rgg rgk rgr rke rkg rkk rra rrd rrg rrk rrr