-er a-a a-b a-i aaa aab aae aah aai aan aar ab- aba abb abe abh abi abn abr aea aeb aee aeh aei aen aer aha ahb ahe ahh ahi ahn ahr ai- aia aib aie aih aii ain air an- ana anb ane anh ani ann anr ar- ara arb are arh ari arn arr baa bab bae bah bai ban bar bba bbb bbe bbh bbi bbn bbr be- bea beb bee beh bei ben ber bha bhb bhe bhh bhi bhr bi- bia bib bie bih bii bin bir bna bnb bne bni bnn bnr bra brb bre brh bri brn brr eaa eab eae eah eai ean ear eba ebb ebe ebh ebi ebn ebr eea eeb eee een eer eha ehb ehe ehh ehi ehn ehr eia eib eie eii ein eir en- ena enb ene enh eni enn enr era erb ere erh eri ern err h-i haa hab hae hah hai han har hba hbb hbe hbh hbi hbn hbr he- hea heb hee heh hei hen her hha hhb hhe hhh hhi hhn hhr hia hib hie hih hii hin hir hna hnb hne hnh hnn hr- hra hrb hre hrh hri hrn hrr ia- iaa iab iae iah iai ian iar iba ibb ibe ibh ibi ibn ibr ie- iea iee iei ien ier iha ihb ihe ihh ihi ihn ihr iia iib iie iih iii iin iir in- ina inb ine inh ini inn inr ir- ira irb ire iri irn irr n-i naa nab nae nah nai nan nar nba nbb nbe nbi nbn nbr ne- nea neb nee neh nei nen ner nha nhb nhe nhh nhi nhn nhr nia nib nie nih nii nin nir nna nnb nne nnh nni nnn nra nrb nre nri nrn nrr ra- raa rab rae rah rai ran rar rba rbb rbe rbh rbi rbn rbr re- rea reb ree reh rei ren rer rh- rha rhb rhe rhh rhi rhn rhr ria rib rie rih rii rin rir rna rnb rnh rni rnn rnr rra rrb rrh rri rrn rrr