-er a-a a-b aaa aab aae aag aah aak aan aar ab- aba abb abe abg abh abk abn abr aea aeb aee aeg aeh aek aen aer ag- aga agb age agg agh agk agn agr aha ahb ahe ahg ahh ahk ahn ahr aka akb ake akg akh akk akn akr an- ana anb ane ang anh ank ann anr ar- ara arb are arg arh ark arn arr baa bab bae bag bah bak ban bar bba bbb bbe bbg bbh bbk bbn bbr be- bea beb bee beg beh bek ben ber bga bgb bge bgg bgh bgk bgn bgr bha bhb bhe bhg bhh bhk bhr bka bkb bke bkg bkk bkn bkr bna bnb bne bng bnk bnn bnr bra brb bre brg brh brk brn brr eaa eab eae eag eah eak ean ear eba ebb ebe ebg ebh ebk ebn ebr eea eeb eee eeg eek een eer ega egb ege egg egh egn egr eha ehb ehe ehg ehh ehn ehr eka ekb eke ekg ekh ekr en- ena enb ene eng enh enk enn enr era erb ere erg erh erk ern err gaa gab gae gag gah gak gan gar gba gbe gbg gbh gbk gbn gbr ge- gea geb gee geg geh gek gen ger gga ggb ggg ggh ggn ggr gha ghb ghe ghg ghh ghn ghr gka gkb gkh gkn gna gnb gne gnn gnr gra grb gre grg grh grk grn grr haa hab hae hag hah hak han har hba hbb hbe hbg hbh hbk hbn hbr he- hea heb hee heg heh hek hen her hga hgb hge hgg hgh hgk hgn hgr hha hhb hhe hhg hhh hhk hhn hhr hka hkb hkg hkh hkk hkn hkr hna hnb hne hng hnh hnk hnn hr- hra hrb hre hrg hrh hrk hrn hrr ka- kaa kab kae kag kah kak kan kar kba kbb kbe kbh kbk kbn kbr ke- kea keb kee keg keh kek ken ker kga kgb kgh kha khe khh khk khn khr kkb kke kkh kkk kkn kkr kn- kna kne kng knk knn knr kra krg krk krn krr naa nab nae nag nah nak nan nar nba nbb nbe nbg nbk nbn nbr ne- nea neb nee neg neh nek nen ner nga ngb nge ngg ngh ngk ngn nha nhb nhe nhg nhh nhk nhn nhr nka nke nkk nkn nkr nna nnb nne nng nnh nnk nnn nra nrb nre nrg nrk nrn nrr ra- raa rab rae rag rah rak ran rar rba rbb rbe rbg rbh rbk rbn rbr re- rea reb ree reg reh rek ren rer rga rgb rge rgg rgh rgk rgn rgr rh- rha rhb rhe rhg rhh rhn rhr rkb rke rkg rkk rna rnb rng rnh rnn rnr rra rrb rrg rrh rrk rrn rrr