-al a-a a-c aaa aac aad aae aaf aak aal ac- aca acc acd ace acf ack acl ad- ada adc add ade adf adk adl aea aec aed aee aef aek ael af- afa afc afd afe aff afk afl aka akc akd ake akk akl al- ala alc ald ale alf alk all c-- caa cac cad cae caf cak cal cca ccc ccd cce ccf cck ccl cda cdc cdd cde cdf cdk cdl ce- cea cec ced cee cef cek cel cfa cfc cfd cfe cff cfk cfl cka ckc ckd cl- cla clc cld cle clf clk cll daa dac dad dae daf dak dal dca dcc dcd dce dcf dck dcl dda ddc ddd dde ddf ddk ddl de- dea dec ded dee def dek del dfa dfc dfd dfe dff dfk dfl dka dkc dke dkk dkl dl- dla dlc dld dle dlf dlk dll eaa eac ead eae eaf eak eal ec- eca ecc ecd ece ecf eck ecl ed- eda edc edd ede edf edk edl eea eec eed eee eef eek eel ef- efa efc efd efe eff efl eka ekc ekd eke ekf ekl ela elc eld ele elf elk ell faa fac fad fae faf fak fal fca fcc fcd fce fcf fck fcl fda fdc fdd fde fdf fdk fdl fea fec fed fee fef fek fel ffa ffc ffd ffe fff ffk ffl fka fkc fkf fkk fkl fla flc fld fle flf fll ka- kaa kac kad kae kaf kak kal kca kcc kcd kce kck kcl kda kdc kde kdf kdk kdl ke- kea kec ked kee kef kek kel kfa kfc kfd kff kkc kke kkk kkl kl- kla klc kld klf la- laa lac lad lae laf lak lal lca lcc lcd lce lcf lck lcl lda ldc ldd lde ldf ldk ldl lea lec led lee lef lek lel lfa lfc lfd lfe lff lfk lfl lka lkl lla llc lld lle llf llk lll