-al -er a-a a-b aaa aab aae aaf aag aak aal aar ab- aba abb abe abf abg abk abl abr aea aeb aee aef aeg aek ael aer af- afa afb afe aff afg afk afl afr ag- aga agb age agf agg agk agl agr aka akb ake akg akk akl akr al- ala alb ale alf alg alk all alr ar- ara arb are arf arg ark arl arr baa bab bae baf bag bak bal bar bba bbb bbe bbf bbg bbk bbl bbr be- bea beb bee bef beg bek bel ber bfa bfb bfe bff bfg bfl bfr bga bgb bge bgf bgg bgk bgl bgr bka bkb bke bkf bkg bkk bkl bkr bla blb ble blf blg blk bll blr bra brb bre brf brg brk brl brr eaa eab eae eaf eag eak eal ear eba ebb ebe ebf ebg ebk ebl ebr eea eeb eee eef eeg eek eel eer ef- efa efb efe eff efg efl efr ega egb ege egf egg egl egr eka ekb eke ekf ekg ekl ekr ela elb ele elf elg elk ell elr era erb ere erf erg erk erl err faa fab fae faf fag fak fal far fba fbb fbe fbf fbg fbk fbl fbr fea feb fee fef feg fek fel fer ffa ffe fff ffg ffk ffl ffr fga fgb fge fgf fgg fgl fgr fka fkb fkf fkg fkk fkl fla flb fle flf flg fll flr fra frb fre frf frg frk frl frr gaa gab gae gaf gag gak gal gar gba gbe gbf gbg gbk gbl gbr ge- gea geb gee gef geg gek gel ger gfa gfb gfe gff gfk gfl gfr gga ggb ggg ggr gka gkb gla glb gle glf glg glk gll glr gra grb gre grf grg grk grl grr ka- kaa kab kae kaf kag kak kal kar kba kbb kbe kbf kbk kbl kbr ke- kea keb kee kef keg kek kel ker kfa kff kfg kga kgb kgf kgl kkb kke kkk kkl kkr kl- kla klb klf klg klr kra krf krg krk krl krr la- laa lab lae laf lag lak lal lar lba lbb lbe lbf lbg lbk lbl lbr lea leb lee lef leg lek lel ler lfa lfb lfe lff lfg lfk lfl lfr lga lgb lge lgf lgg lgk lgl lgr lka lkb lkg lkl lkr lla llb lle llf llg llk lll llr lra lrb lrf lrg lrk lrr ra- raa rab rae raf rag rak ral rar rba rbb rbe rbf rbg rbk rbl rbr re- rea reb ree ref reg rek rel rer rfa rfb rfe rff rfg rfk rfl rfr rga rgb rge rgf rgg rgk rgr rkb rke rkf rkg rkk rla rle rlf rlg rll rlr rra rrb rrf rrg rrk rrl rrr