-al a-a a-c aaa aac aae aaf aak aal ac- aca acc ace acf ack acl aea aec aee aef aek ael af- afa afc afe aff afk afl aka akc ake akk akl al- ala alc ale alf alk all c-- caa cac cae caf cak cal cca ccc cce ccf cck ccl ce- cea cec cee cef cek cel cfa cfc cfe cff cfk cfl cka ckc cl- cla clc cle clf clk cll eaa eac eae eaf eak eal ec- eca ecc ece ecf eck ecl eea eec eee eef eek eel ef- efa efc efe eff efl eka ekc eke ekf ekl ela elc ele elf elk ell faa fac fae faf fak fal fca fcc fce fcf fck fcl fea fec fee fef fek fel ffa ffc ffe fff ffk ffl fka fkc fkf fkk fkl fla flc fle flf fll ka- kaa kac kae kaf kak kal kca kcc kce kck kcl ke- kea kec kee kef kek kel kfa kfc kff kkc kke kkk kkl kl- kla klc klf la- laa lac lae laf lak lal lca lcc lce lcf lck lcl lea lec lee lef lek lel lfa lfc lfe lff lfk lfl lka lkl lla llc lle llf llk lll