-er a-a a-b aaa aab aae aag aah aak aar ab- aba abb abe abg abh abk abr aea aeb aee aeg aeh aek aer ag- aga agb age agg agh agk agr aha ahb ahe ahg ahh ahk ahr aka akb ake akg akh akk akr ar- ara arb are arg arh ark arr baa bab bae bag bah bak bar bba bbb bbe bbg bbh bbk bbr be- bea beb bee beg beh bek ber bga bgb bge bgg bgh bgk bgr bha bhb bhe bhg bhh bhk bhr bka bkb bke bkg bkk bkr bra brb bre brg brh brk brr eaa eab eae eag eah eak ear eba ebb ebe ebg ebh ebk ebr eea eeb eee eeg eek eer ega egb ege egg egh egr eha ehb ehe ehg ehh ehr eka ekb eke ekg ekh ekr era erb ere erg erh erk err gaa gab gae gag gah gak gar gba gbe gbg gbh gbk gbr ge- gea geb gee geg geh gek ger gga ggb ggg ggh ggr gha ghb ghe ghg ghh ghr gka gkb gkh gra grb gre grg grh grk grr haa hab hae hag hah hak har hba hbb hbe hbg hbh hbk hbr he- hea heb hee heg heh hek her hga hgb hge hgg hgh hgk hgr hha hhb hhe hhg hhh hhk hhr hka hkb hkg hkh hkk hkr hr- hra hrb hre hrg hrh hrk hrr ka- kaa kab kae kag kah kak kar kba kbb kbe kbh kbk kbr ke- kea keb kee keg keh kek ker kga kgb kgh kha khe khh khk khr kkb kke kkh kkk kkr kra krg krk krr ra- raa rab rae rag rah rak rar rba rbb rbe rbg rbh rbk rbr re- rea reb ree reg reh rek rer rga rgb rge rgg rgh rgk rgr rh- rha rhb rhe rhg rhh rhr rkb rke rkg rkk rra rrb rrg rrh rrk rrr