-er a-a a-b a-i aaa aab aad aae aai aak aan aar ab- aba abb abd abe abi abk abn abr ad- ada adb add ade adi adk adn adr aea aeb aed aee aei aek aen aer ai- aia aib aid aie aii aik ain air aka akb akd ake aki akk akn akr an- ana anb and ane ani ank ann anr ar- ara arb ard are ari ark arn arr baa bab bad bae bai bak ban bar bba bbb bbd bbe bbi bbk bbn bbr bda bdb bdd bde bdi bdk bdr be- bea beb bed bee bei bek ben ber bi- bia bib bid bie bii bik bin bir bka bkb bke bkk bkn bkr bna bnb bnd bne bni bnk bnn bnr bra brb brd bre bri brk brn brr daa dab dad dae dai dak dan dar dba dbb dbd dbe dbi dbk dbn dbr dda ddb ddd dde ddi ddk ddn ddr de- dea deb ded dee dei dek den der di- dia dib did die dii dik din dir dka dkb dke dki dkk dkr dna dnb dnd dne dni dnk dnn dnr dra drb drd dre dri drk drn drr eaa eab ead eae eai eak ean ear eba ebb ebd ebe ebi ebk ebn ebr ed- eda edb edd ede edi edk edn edr eea eeb eed eee eek een eer eia eib eid eie eii eik ein eir eka ekb ekd eke eki ekr en- ena enb end ene eni enk enn enr era erb erd ere eri erk ern err i-d ia- iaa iab iad iae iai ian iar iba ibb ibd ibe ibi ibk ibn ibr ida idb idd ide idi idk idn idr ie- iea ied iee iei iek ien ier iia iib iid iie iii iin iir ika ikb ike iki ikk ikr in- ina inb ind ine ini ink inn inr ir- ira irb ird ire iri irk irn irr ka- kaa kab kad kae kai kak kan kar kba kbb kbd kbe kbi kbk kbn kbr kda kdb kde kdk kdr ke- kea keb ked kee kei kek ken ker kia kib kid kie kii kik kin kir kkb kke kki kkk kkn kkr kn- kna knd kne kni knk knn knr kra krd kri krk krn krr n-i naa nab nad nae nai nak nan nar nba nbb nbd nbe nbi nbk nbn nbr nda ndb ndd nde ndi ndk ndn ndr ne- nea neb ned nee nei nek nen ner nia nib nid nie nii nik nin nir nka nke nki nkk nkn nkr nna nnb nne nni nnk nnn nra nrb nrd nre nri nrk nrn nrr ra- raa rab rad rae rai rak ran rar rba rbb rbd rbe rbi rbk rbn rbr rda rdb rdd rde rdi rdn rdr re- rea reb red ree rei rek ren rer ria rib rid rie rii rik rin rir rkb rke rkk rna rnb rnd rni rnn rnr rra rrb rrd rri rrk rrn rrr