-er a-a a-b aaa aab aae aah aak aan aar ab- aba abb abe abh abk abn abr aea aeb aee aeh aek aen aer aha ahb ahe ahh ahk ahn ahr aka akb ake akh akk akn akr an- ana anb ane anh ank ann anr ar- ara arb are arh ark arn arr baa bab bae bah bak ban bar bba bbb bbe bbh bbk bbn bbr be- bea beb bee beh bek ben ber bha bhb bhe bhh bhk bhr bka bkb bke bkk bkn bkr bna bnb bne bnk bnn bnr bra brb bre brh brk brn brr eaa eab eae eah eak ean ear eba ebb ebe ebh ebk ebn ebr eea eeb eee eek een eer eha ehb ehe ehh ehn ehr eka ekb eke ekh ekr en- ena enb ene enh enk enn enr era erb ere erh erk ern err haa hab hae hah hak han har hba hbb hbe hbh hbk hbn hbr he- hea heb hee heh hek hen her hha hhb hhe hhh hhk hhn hhr hka hkb hkh hkk hkn hkr hna hnb hne hnh hnk hnn hr- hra hrb hre hrh hrk hrn hrr ka- kaa kab kae kah kak kan kar kba kbb kbe kbh kbk kbn kbr ke- kea keb kee keh kek ken ker kha khe khh khk khn khr kkb kke kkh kkk kkn kkr kn- kna kne knk knn knr kra krk krn krr naa nab nae nah nak nan nar nba nbb nbe nbk nbn nbr ne- nea neb nee neh nek nen ner nha nhb nhe nhh nhk nhn nhr nka nke nkk nkn nkr nna nnb nne nnh nnk nnn nra nrb nre nrk nrn nrr ra- raa rab rae rah rak ran rar rba rbb rbe rbh rbk rbn rbr re- rea reb ree reh rek ren rer rh- rha rhb rhe rhh rhn rhr rkb rke rkk rna rnb rnh rnn rnr rra rrb rrh rrk rrn rrr