-er a-a a-b aaa aab aad aae aag aan aar aav ab- aba abb abd abe abg abn abr abv ad- ada adb add ade adg adn adr adv aea aeb aed aee aeg aen aer aev ag- aga agb agd age agg agn agr agv an- ana anb and ane ang ann anr anv ar- ara arb ard are arg arn arr arv av- ava avb avd ave avg avn avr baa bab bad bae bag ban bar bav bba bbb bbd bbe bbg bbn bbr bda bdb bdd bde bdg bdr bdv be- bea beb bed bee beg ben ber bev bga bgb bgd bge bgg bgn bgr bgv bna bnb bnd bne bng bnn bnr bnv bra brb brd bre brg brn brr brv bva bvb bvd bve bvg bvn bvr bvv daa dab dad dae dag dan dar dav dba dbb dbd dbe dbg dbn dbr dbv dda ddb ddd dde ddg ddn ddr de- dea deb ded dee deg den der dev dga dgd dge dgg dgn dgr dna dnb dnd dne dng dnn dnr dra drb drd dre drg drn drr drv dva dvb dvd dve dvg dvn dvr eaa eab ead eae eag ean ear eav eba ebb ebd ebe ebg ebn ebr ebv ed- eda edb edd ede edg edn edr eea eeb eed eee eeg een eer eev ega egb egd ege egg egn egr en- ena enb end ene eng enn enr env era erb erd ere erg ern err erv eva evb evd eve evg evn evr evv g-d gaa gab gad gae gag gan gar gav gba gbd gbe gbg gbn gbr gbv gda gdb gdd gde gdn gdr gdv ge- gea geb ged gee geg gen ger gev gga ggb ggd ggg ggn ggr ggv gna gnb gnd gne gnn gnr gnv gra grb grd gre grg grn grr grv gva gvb gvd gve gvg gvn gvr naa nab nad nae nag nan nar nav nba nbb nbd nbe nbg nbn nbr nbv nda ndb ndd nde ndg ndn ndr ndv ne- nea neb ned nee neg nen ner nev nga ngb ngd nge ngg ngn nna nnb nne nng nnn nnv nra nrb nrd nre nrg nrn nrr nrv nva nvb nvd nve nvg nvn nvv ra- raa rab rad rae rag ran rar rav rba rbb rbd rbe rbg rbn rbr rda rdb rdd rde rdg rdn rdr rdv re- rea reb red ree reg ren rer rev rga rgb rgd rge rgg rgn rgr rgv rna rnb rnd rng rnn rnr rnv rra rrb rrd rrg rrn rrr rva rvb rvd rve rvg rvn rvr rvv v-a v-e vaa vab vad vae vag van var vav vba vbd vbg vbr vbv vdb vdd vde vdg vdr vdv vea veb ved vee veg ven ver vga vgg vgn vgr vn- vna vnd vng vnr vnv vra vrb vrd vre vrg vrn vrr vva vvb vvg vvr vvv