-al a-a a-b aaa aab aad aae aaf aal ab- aba abb abd abe abf abl ad- ada adb add ade adf adl aea aeb aed aee aef ael af- afa afb afd afe aff afl al- ala alb ald ale alf all baa bab bad bae baf bal bba bbb bbd bbe bbf bbl bda bdb bdd bde bdf bdl be- bea beb bed bee bef bel bfa bfb bfd bfe bff bfl bla blb bld ble blf bll daa dab dad dae daf dal dba dbb dbd dbe dbf dbl dda ddb ddd dde ddf ddl de- dea deb ded dee def del dfa dfb dfd dfe dff dfl dl- dla dlb dld dle dlf dll eaa eab ead eae eaf eal eba ebb ebd ebe ebf ebl ed- eda edb edd ede edf edl eea eeb eed eee eef eel ef- efa efb efd efe eff efl ela elb eld ele elf ell faa fab fad fae faf fal fba fbb fbd fbe fbf fbl fda fdb fdd fde fdf fdl fea feb fed fee fef fel ffa ffd ffe fff ffl fla flb fld fle flf fll la- laa lab lad lae laf lal lba lbb lbd lbe lbf lbl lda ldb ldd lde ldf ldl lea leb led lee lef lel lfa lfb lfd lfe lff lfl lla llb lld lle llf lll