-er a-a a-b a-i a-t aaa aab aad aae aai aan aar aat ab- aba abb abd abe abi abn abr abt ad- ada adb add ade adi adn adr adt aea aeb aed aee aei aen aer aet ai- aia aib aid aie aii ain air ait an- ana anb and ane ani ann anr ant ar- ara arb ard are ari arn arr art at- ata atb atd ate ati atn atr att baa bab bad bae bai ban bar bat bba bbb bbd bbe bbi bbn bbr bbt bda bdb bdd bde bdi bdr bdt be- bea beb bed bee bei ben ber bet bi- bia bib bid bie bii bin bir bit bna bnb bnd bne bni bnn bnr bnt bra brb brd bre bri brn brr brt bta btb btd bte bti btn btr btt daa dab dad dae dai dan dar dat dba dbb dbd dbe dbi dbn dbr dbt dda ddb ddd dde ddi ddn ddr ddt de- dea deb ded dee dei den der det di- dia dib did die dii din dir dit dna dnb dnd dne dni dnn dnr dnt dra drb drd dre dri drn drr drt dta dtb dtd dte dti dtn dtr dtt eaa eab ead eae eai ean ear eat eba ebb ebd ebe ebi ebn ebr ebt ed- eda edb edd ede edi edn edr edt eea eeb eed eee een eer eet eia eib eid eie eii ein eir eit en- ena enb end ene eni enn enr ent era erb erd ere eri ern err ert eta etb etd ete eti etn etr ett i-d ia- iaa iab iad iae iai ian iar iat iba ibb ibd ibe ibi ibn ibr ibt ida idb idd ide idi idn idr idt ie- iea ied iee iei ien ier iet iia iib iid iie iii iin iir iit in- ina inb ind ine ini inn inr int ir- ira irb ird ire iri irn irr irt ita itb itd ite iti itn itt n-i naa nab nad nae nai nan nar nat nba nbb nbd nbe nbi nbn nbr nbt nda ndb ndd nde ndi ndn ndr ndt ne- nea neb ned nee nei nen ner net nia nib nid nie nii nin nir nit nna nnb nne nni nnn nnt nra nrb nrd nre nri nrn nrr nrt nta ntb ntd nte nti ntn ntr ntt ra- raa rab rad rae rai ran rar rat rba rbb rbd rbe rbi rbn rbr rbt rda rdb rdd rde rdi rdn rdr rdt re- rea reb red ree rei ren rer ret ria rib rid rie rii rin rir rit rna rnb rnd rni rnn rnr rnt rra rrb rrd rri rrn rrr rrt rta rtb rtd rte rti rtn rtr rtt taa tab tad tae tai tan tar tat tba tbb tbd tbe tbi tbn tbr tbt tda tdb tdd tde tdi tdn tdr tdt te- tea teb ted tee tei ten ter tet tia tib tid tie tii tin tir tit tna tnb tnd tne tni tnn tnr tnt tra trb trd tre tri trn trr trt tta ttb ttd tte tti ttn ttr ttt