a-a a-b a-c aaa aab aac aae aah aak aam ab- aba abb abc abe abh abk abm ac- aca acb acc ace ach ack acm aea aeb aec aee aeh aek aem aha ahb ahc ahe ahh ahk ahm aka akb akc ake akh akk akm ama amb amc ame amh amk amm baa bab bac bae bah bak bam bba bbb bbc bbe bbh bbk bbm bca bcb bcc bce bch bck bcm be- bea beb bec bee beh bek bem bha bhb bhc bhe bhh bhk bhm bka bkb bkc bke bkk bkm bma bmb bmc bme bmh bmk bmm c-- caa cab cac cae cah cak cam cba cbb cbc cbe cbh cbk cbm cca ccb ccc cce cch cck ccm ce- cea ceb cec cee ceh cek cem ch- cha chb chc che chh chk chm cka ckb ckc ckh ckm cma cmb cmc cme cmh cmk cmm eaa eab eac eae eah eak eam eba ebb ebc ebe ebh ebk ebm ec- eca ecb ecc ece ech eck ecm eea eeb eec eee eek eem eha ehb ehc ehe ehh ehm eka ekb ekc eke ekh em- ema emb emc eme emh emk emm haa hab hac hae hah hak ham hba hbb hbc hbe hbh hbk hbm hca hcb hcc hce hch hck hcm he- hea heb hec hee heh hek hem hha hhb hhc hhe hhh hhk hhm hka hkb hkh hkk hkm hma hmb hmc hme hmh hmk hmm ka- kaa kab kac kae kah kak kam kba kbb kbc kbe kbh kbk kbm kca kcb kcc kce kch kck kcm ke- kea keb kec kee keh kek kem kha khe khh khk khm kkb kkc kke kkh kkk kkm kma kmb kmc kme kmh kmk kmm maa mab mac mae mah mak mam mba mbb mbc mbe mbh mbk mbm mc- mca mcb mcc mce mch mck mcm mea meb mec mee meh mek mem mha mhc mhh mhk mhm mka mkb mkc mke mkh mkk mkm mma mmb mmc mme mmh mmk mmm