-al a-a a-b a-t aaa aab aae aaf aal aat ab- aba abb abe abf abl abt aea aeb aee aef ael aet af- afa afb afe aff afl aft al- ala alb ale alf all alt at- ata atb ate atf atl att baa bab bae baf bal bat bba bbb bbe bbf bbl bbt be- bea beb bee bef bel bet bfa bfb bfe bff bfl bft bla blb ble blf bll blt bta btb bte btf btl btt eaa eab eae eaf eal eat eba ebb ebe ebf ebl ebt eea eeb eee eef eel eet ef- efa efb efe eff efl eft ela elb ele elf ell elt eta etb ete etf etl ett faa fab fae faf fal fat fba fbb fbe fbf fbl fbt fea feb fee fef fel fet ffa ffe fff ffl fft fla flb fle flf fll flt fta ftb fte ftf ftl ftt la- laa lab lae laf lal lat lba lbb lbe lbf lbl lbt lea leb lee lef lel let lfa lfb lfe lff lfl lft lla llb lle llf lll llt lta ltb lte ltf ltl ltt taa tab tae taf tal tat tba tbb tbe tbf tbl tbt te- tea teb tee tef tel tet tfa tfb tfe tff tfl tft tla tle tlf tll tlt tta ttb tte ttf ttl ttt