a-a a-c aaa aac aae aaf aah aak ac- aca acc ace acf ach ack aea aec aee aef aeh aek af- afa afc afe aff afh afk aha ahc ahe ahf ahh ahk aka akc ake akh akk c-- caa cac cae caf cah cak cca ccc cce ccf cch cck ce- cea cec cee cef ceh cek cfa cfc cfe cff cfh cfk ch- cha chc che chf chh chk cka ckc ckh eaa eac eae eaf eah eak ec- eca ecc ece ecf ech eck eea eec eee eef eek ef- efa efc efe eff efh eha ehc ehe ehf ehh eka ekc eke ekf ekh faa fac fae faf fah fak fca fcc fce fcf fck fea fec fee fef feh fek ffa ffc ffe fff ffh ffk fha fhc fhe fhf fhh fka fkc fkf fkk haa hac hae haf hah hak hca hcc hce hcf hch hck he- hea hec hee hef heh hek hfa hfc hfe hff hfh hfk hha hhc hhe hhf hhh hhk hka hkf hkh hkk ka- kaa kac kae kaf kah kak kca kcc kce kch kck ke- kea kec kee kef keh kek kfa kfc kff kfh kha khe khf khh khk kkc kke kkh kkk