-er a-a a-b a-i aaa aab aad aae aag aai aan aar ab- aba abb abd abe abg abi abn abr ad- ada adb add ade adg adi adn adr aea aeb aed aee aeg aei aen aer ag- aga agb agd age agg agi agn agr ai- aia aib aid aie aig aii ain air an- ana anb and ane ang ani ann anr ar- ara arb ard are arg ari arn arr baa bab bad bae bag bai ban bar bba bbb bbd bbe bbg bbi bbn bbr bda bdb bdd bde bdg bdi bdr be- bea beb bed bee beg bei ben ber bga bgb bgd bge bgg bgi bgn bgr bi- bia bib bid bie big bii bin bir bna bnb bnd bne bng bni bnn bnr bra brb brd bre brg bri brn brr daa dab dad dae dag dai dan dar dba dbb dbd dbe dbg dbi dbn dbr dda ddb ddd dde ddg ddi ddn ddr de- dea deb ded dee deg dei den der dga dgd dge dgg dgi dgn dgr di- dia dib did die dig dii din dir dna dnb dnd dne dng dni dnn dnr dra drb drd dre drg dri drn drr eaa eab ead eae eag eai ean ear eba ebb ebd ebe ebg ebi ebn ebr ed- eda edb edd ede edg edi edn edr eea eeb eed eee eeg een eer ega egb egd ege egg egi egn egr eia eib eid eie eig eii ein eir en- ena enb end ene eng eni enn enr era erb erd ere erg eri ern err g-d gaa gab gad gae gag gai gan gar gba gbd gbe gbg gbi gbn gbr gda gdb gdd gde gdi gdn gdr ge- gea geb ged gee geg gei gen ger gga ggb ggd ggg ggi ggn ggr gia gib gid gie gig gii gin gir gna gnb gnd gne gni gnn gnr gra grb grd gre grg gri grn grr i-d ia- iaa iab iad iae iag iai ian iar iba ibb ibd ibe ibg ibi ibn ibr ida idb idd ide idg idi idn idr ie- iea ied iee ieg iei ien ier iga igb igd ige igg igi ign igr iia iib iid iie iii iin iir in- ina inb ind ine ing ini inn inr ir- ira irb ird ire irg iri irn irr n-i naa nab nad nae nag nai nan nar nba nbb nbd nbe nbg nbi nbn nbr nda ndb ndd nde ndg ndi ndn ndr ne- nea neb ned nee neg nei nen ner nga ngb ngd nge ngg ngi ngn nia nib nid nie nig nii nin nir nna nnb nne nng nni nnn nra nrb nrd nre nrg nri nrn nrr ra- raa rab rad rae rag rai ran rar rba rbb rbd rbe rbg rbi rbn rbr rda rdb rdd rde rdg rdi rdn rdr re- rea reb red ree reg rei ren rer rga rgb rgd rge rgg rgi rgn rgr ria rib rid rie rig rii rin rir rna rnb rnd rng rni rnn rnr rra rrb rrd rrg rri rrn rrr