-er a-a a-b a-t aaa aab aad aae aag aan aar aat ab- aba abb abd abe abg abn abr abt ad- ada adb add ade adg adn adr adt aea aeb aed aee aeg aen aer aet ag- aga agb agd age agg agn agr agt an- ana anb and ane ang ann anr ant ar- ara arb ard are arg arn arr art at- ata atb atd ate atg atn atr att baa bab bad bae bag ban bar bat bba bbb bbd bbe bbg bbn bbr bbt bda bdb bdd bde bdg bdr bdt be- bea beb bed bee beg ben ber bet bga bgb bgd bge bgg bgn bgr bgt bna bnb bnd bne bng bnn bnr bnt bra brb brd bre brg brn brr brt bta btb btd bte btg btn btr btt daa dab dad dae dag dan dar dat dba dbb dbd dbe dbg dbn dbr dbt dda ddb ddd dde ddg ddn ddr ddt de- dea deb ded dee deg den der det dga dgd dge dgg dgn dgr dgt dna dnb dnd dne dng dnn dnr dnt dra drb drd dre drg drn drr drt dta dtb dtd dte dtg dtn dtr dtt eaa eab ead eae eag ean ear eat eba ebb ebd ebe ebg ebn ebr ebt ed- eda edb edd ede edg edn edr edt eea eeb eed eee eeg een eer eet ega egb egd ege egg egn egr egt en- ena enb end ene eng enn enr ent era erb erd ere erg ern err ert eta etb etd ete etg etn etr ett g-d gaa gab gad gae gag gan gar gat gba gbd gbe gbg gbn gbr gbt gda gdb gdd gde gdn gdr gdt ge- gea geb ged gee geg gen ger get gga ggb ggd ggg ggn ggr ggt gna gnb gnd gne gnn gnr gnt gra grb grd gre grg grn grr grt gta gtb gtd gte gtg gtn gtr gtt naa nab nad nae nag nan nar nat nba nbb nbd nbe nbg nbn nbr nbt nda ndb ndd nde ndg ndn ndr ndt ne- nea neb ned nee neg nen ner net nga ngb ngd nge ngg ngn ngt nna nnb nne nng nnn nnt nra nrb nrd nre nrg nrn nrr nrt nta ntb ntd nte ntg ntn ntr ntt ra- raa rab rad rae rag ran rar rat rba rbb rbd rbe rbg rbn rbr rbt rda rdb rdd rde rdg rdn rdr rdt re- rea reb red ree reg ren rer ret rga rgb rgd rge rgg rgn rgr rgt rna rnb rnd rng rnn rnr rnt rra rrb rrd rrg rrn rrr rrt rta rtb rtd rte rtg rtn rtr rtt taa tab tad tae tag tan tar tat tba tbb tbd tbe tbg tbn tbr tbt tda tdb tdd tde tdg tdn tdr tdt te- tea teb ted tee teg ten ter tet tga tgb tge tgg tgn tgr tgt tna tnb tnd tne tng tnn tnr tnt tra trb trd tre trg trn trr trt tta ttb ttd tte ttg ttn ttr ttt