-al -er a-a a-b a-t aaa aab aae aag aal aar aat ab- aba abb abe abg abl abr abt aea aeb aee aeg ael aer aet ag- aga agb age agg agl agr agt al- ala alb ale alg all alr alt ar- ara arb are arg arl arr art at- ata atb ate atg atl atr att baa bab bae bag bal bar bat bba bbb bbe bbg bbl bbr bbt be- bea beb bee beg bel ber bet bga bgb bge bgg bgl bgr bgt bla blb ble blg bll blr blt bra brb bre brg brl brr brt bta btb bte btg btl btr btt eaa eab eae eag eal ear eat eba ebb ebe ebg ebl ebr ebt eea eeb eee eeg eel eer eet ega egb ege egg egl egr egt ela elb ele elg ell elr elt era erb ere erg erl err ert eta etb ete etg etl etr ett gaa gab gae gag gal gar gat gba gbe gbg gbl gbr gbt ge- gea geb gee geg gel ger get gga ggb ggg ggr ggt gla glb gle glg gll glr glt gra grb gre grg grl grr grt gta gtb gte gtg gtl gtr gtt la- laa lab lae lag lal lar lat lba lbb lbe lbg lbl lbr lbt lea leb lee leg lel ler let lga lgb lge lgg lgl lgr lgt lla llb lle llg lll llr llt lra lrb lrg lrr lrt lta ltb lte ltg ltl ltr ltt ra- raa rab rae rag ral rar rat rba rbb rbe rbg rbl rbr rbt re- rea reb ree reg rel rer ret rga rgb rge rgg rgr rgt rla rle rlg rll rlr rlt rra rrb rrg rrl rrr rrt rta rtb rte rtg rtl rtr rtt taa tab tae tag tal tar tat tba tbb tbe tbg tbl tbr tbt te- tea teb tee teg tel ter tet tga tgb tge tgg tgl tgr tgt tla tle tlg tll tlr tlt tra trb tre trg trl trr trt tta ttb tte ttg ttl ttr ttt