-al -er a-a a-b a-i a-t aaa aab aae aag aai aal aar aat ab- aba abb abe abg abi abl abr abt aea aeb aee aeg aei ael aer aet ag- aga agb age agg agi agl agr agt ai- aia aib aie aig aii ail air ait al- ala alb ale alg ali all alr alt ar- ara arb are arg ari arl arr art at- ata atb ate atg ati atl atr att baa bab bae bag bai bal bar bat bba bbb bbe bbg bbi bbl bbr bbt be- bea beb bee beg bei bel ber bet bga bgb bge bgg bgi bgl bgr bgt bi- bia bib bie big bii bil bir bit bla blb ble blg bli bll blr blt bra brb bre brg bri brl brr brt bta btb bte btg bti btl btr btt eaa eab eae eag eai eal ear eat eba ebb ebe ebg ebi ebl ebr ebt eea eeb eee eeg eel eer eet ega egb ege egg egi egl egr egt eia eib eie eig eii eil eir eit ela elb ele elg eli ell elr elt era erb ere erg eri erl err ert eta etb ete etg eti etl etr ett gaa gab gae gag gai gal gar gat gba gbe gbg gbi gbl gbr gbt ge- gea geb gee geg gei gel ger get gga ggb ggg ggi ggr ggt gia gib gie gig gii gil gir git gla glb gle glg gli gll glr glt gra grb gre grg gri grl grr grt gta gtb gte gtg gti gtl gtr gtt ia- iaa iab iae iag iai ial iar iat iba ibb ibe ibg ibi ibl ibr ibt ie- iea iee ieg iei iel ier iet iga igb ige igg igi igl igr igt iia iib iie iii iil iir iit il- ila ilb ile ilg ili ill ilr ilt ir- ira irb ire irg iri irl irr irt ita itb ite itg iti itl itt la- laa lab lae lag lai lal lar lat lba lbb lbe lbg lbi lbl lbr lbt lea leb lee leg lei lel ler let lga lgb lge lgg lgi lgl lgr lgt lia lib lie lig lii lil lir lit lla llb lle llg lli lll llr llt lra lrb lrg lri lrr lrt lta ltb lte ltg lti ltl ltr ltt ra- raa rab rae rag rai ral rar rat rba rbb rbe rbg rbi rbl rbr rbt re- rea reb ree reg rei rel rer ret rga rgb rge rgg rgi rgr rgt ria rib rie rig rii ril rir rit rla rle rlg rli rll rlr rlt rra rrb rrg rri rrl rrr rrt rta rtb rte rtg rti rtl rtr rtt taa tab tae tag tai tal tar tat tba tbb tbe tbg tbi tbl tbr tbt te- tea teb tee teg tei tel ter tet tga tgb tge tgg tgi tgl tgr tgt tia tib tie tig tii til tir tit tla tle tlg tli tll tlr tlt tra trb tre trg tri trl trr trt tta ttb tte ttg tti ttl ttr ttt