-al a-a a-b aaa aab aae aaf aal ab- aba abb abe abf abl aea aeb aee aef ael af- afa afb afe aff afl al- ala alb ale alf all baa bab bae baf bal bba bbb bbe bbf bbl be- bea beb bee bef bel bfa bfb bfe bff bfl bla blb ble blf bll eaa eab eae eaf eal eba ebb ebe ebf ebl eea eeb eee eef eel ef- efa efb efe eff efl ela elb ele elf ell faa fab fae faf fal fba fbb fbe fbf fbl fea feb fee fef fel ffa ffe fff ffl fla flb fle flf fll la- laa lab lae laf lal lba lbb lbe lbf lbl lea leb lee lef lel lfa lfb lfe lff lfl lla llb lle llf lll