-er a-a a-b a-i aaa aab aad aae aaf aai aan aar ab- aba abb abd abe abf abi abn abr ad- ada adb add ade adf adi adn adr aea aeb aed aee aef aei aen aer af- afa afb afd afe aff afi afn afr ai- aia aib aid aie aif aii ain air an- ana anb and ane anf ani ann anr ar- ara arb ard are arf ari arn arr baa bab bad bae baf bai ban bar bba bbb bbd bbe bbf bbi bbn bbr bda bdb bdd bde bdf bdi bdr be- bea beb bed bee bef bei ben ber bfa bfb bfd bfe bff bfi bfn bfr bi- bia bib bid bie bif bii bin bir bna bnb bnd bne bnf bni bnn bnr bra brb brd bre brf bri brn brr daa dab dad dae daf dai dan dar dba dbb dbd dbe dbf dbi dbn dbr dda ddb ddd dde ddf ddi ddn ddr de- dea deb ded dee def dei den der dfa dfb dfd dfe dff dfi dfn dfr di- dia dib did die dif dii din dir dna dnb dnd dne dnf dni dnn dnr dra drb drd dre dri drn drr eaa eab ead eae eaf eai ean ear eba ebb ebd ebe ebf ebi ebn ebr ed- eda edb edd ede edf edi edn edr eea eeb eed eee eef een eer ef- efa efb efd efe eff efi efr eia eib eid eie eif eii ein eir en- ena enb end ene enf eni enn enr era erb erd ere erf eri ern err faa fab fad fae faf fai fan far fba fbb fbd fbe fbf fbi fbn fbr fda fdb fdd fde fdf fdi fdn fdr fea feb fed fee fef fei fen fer ffa ffd ffe fff ffi ffn ffr fia fib fid fie fif fii fin fir fna fnb fnd fne fnf fni fnn fnr fra frb frd fre frf fri frn frr i-d i-f ia- iaa iab iad iae iaf iai ian iar iba ibb ibd ibe ibf ibi ibn ibr ida idb idd ide idf idi idn idr ie- iea ied iee ief iei ien ier ifa ifb ifd ife iff ifi ifn ifr iia iib iid iie iif iii iin iir in- ina inb ind ine inf ini inn inr ir- ira irb ird ire irf iri irn irr n-i naa nab nad nae naf nai nan nar nba nbb nbd nbe nbf nbi nbn nbr nda ndb ndd nde ndf ndi ndn ndr ne- nea neb ned nee nef nei nen ner nfa nfb nfd nfe nff nfi nfn nfr nia nib nid nie nif nii nin nir nna nnb nne nnf nni nnn nra nrb nrd nre nrf nri nrn nrr ra- raa rab rad rae raf rai ran rar rba rbb rbd rbe rbf rbi rbn rbr rda rdb rdd rde rdf rdi rdn rdr re- rea reb red ree ref rei ren rer rfa rfb rfd rfe rff rfi rfn rfr ria rib rid rie rif rii rin rir rna rnb rnd rni rnn rnr rra rrb rrd rrf rri rrn rrr