-er a-a a-b aaa aab aae aag aan aar aaw ab- aba abb abe abg abn abr abw aea aeb aee aeg aen aer aew ag- aga agb age agg agn agr agw an- ana anb ane ang ann anr ar- ara arb are arg arn arr arw aw- awa awb awe awg awn awr aww baa bab bae bag ban bar baw bba bbb bbe bbg bbn bbr bbw be- bea beb bee beg ben ber bew bga bgb bge bgg bgn bgr bgw bna bnb bne bng bnn bnr bnw bra brb bre brg brn brr brw bwa bwb bwg bwr eaa eab eae eag ean ear eaw eba ebb ebe ebg ebn ebr ebw eea eeb eee eeg een eer eew ega egb ege egg egn egr egw en- ena enb ene eng enn enr enw era erb ere erg ern err erw ewa ewb ewe ewr eww gaa gab gae gag gan gar gaw gba gbe gbg gbn gbr gbw ge- gea geb gee geg gen ger gew gga ggb ggg ggn ggr ggw gna gnb gne gnn gnr gnw gra grb gre grg grn grr grw gwa gwb gwe gwg gwn gwr naa nab nae nag nan nar naw nba nbb nbe nbg nbn nbr nbw ne- nea neb nee neg nen ner new nga ngb nge ngg ngn ngw nna nnb nne nng nnn nnw nra nrb nre nrg nrn nrr nrw nwa nwb nwe nwn nwr ra- raa rab rae rag ran rar raw rba rbb rbe rbg rbn rbr rbw re- rea reb ree reg ren rer rew rga rgb rge rgg rgn rgr rgw rna rnb rng rnn rnr rnw rra rrb rrg rrn rrr rwa rwb rwe rwr waa wab wae wag wan war waw wba wbb wbe wbg wbn wbr wbw wea web wee weg wen wer wew wga wgb wgn wgr wgw wn- wna wne wng wnn wnw wr- wra wre wrg wrn wrr wrw wwa wwe wwn www