a-a a-b a-c aaa aab aac aae aah aak aam aas ab- aba abb abc abe abh abk abm abs ac- aca acb acc ace ach ack acm acs aea aeb aec aee aeh aek aem aes aha ahb ahc ahe ahh ahk ahm ahs aka akb akc ake akh akk akm aks ama amb amc ame amh amk amm ams as- asa asb asc ase ash ask asm ass baa bab bac bae bah bak bam bas bba bbb bbc bbe bbh bbk bbm bbs bca bcb bcc bce bch bck bcm bcs be- bea beb bec bee beh bek bem bes bha bhb bhc bhe bhh bhk bhm bhs bka bkb bkc bke bkk bkm bks bma bmb bmc bme bmh bmk bmm bms bsa bsb bsc bse bsh bsk bsm bss c-- caa cab cac cae cah cak cam cas cba cbb cbc cbe cbh cbk cbm cbs cca ccb ccc cce cch cck ccm ccs ce- cea ceb cec cee ceh cek cem ces ch- cha chb chc che chh chk chm chs cka ckb ckc ckh ckm cks cma cmb cmc cme cmh cmk cmm cms csa csb csc cse csh csk csm css eaa eab eac eae eah eak eam eas eba ebb ebc ebe ebh ebk ebm ebs ec- eca ecb ecc ece ech eck ecm ecs eea eeb eec eee eek eem ees eha ehb ehc ehe ehh ehm ehs eka ekb ekc eke ekh eks em- ema emb emc eme emh emk emm ems es- esa esb esc ese esh esk esm ess haa hab hac hae hah hak ham has hba hbb hbc hbe hbh hbk hbm hbs hca hcb hcc hce hch hck hcm hcs he- hea heb hec hee heh hek hem hes hha hhb hhc hhe hhh hhk hhm hhs hka hkb hkh hkk hkm hks hma hmb hmc hme hmh hmk hmm hms hsa hsb hsc hse hsh hsk hsm hss ka- kaa kab kac kae kah kak kam kas kba kbb kbc kbe kbh kbk kbm kbs kca kcb kcc kce kch kck kcm kcs ke- kea keb kec kee keh kek kem kes kha khe khh khk khm khs kkb kkc kke kkh kkk kkm kks kma kmb kmc kme kmh kmk kmm kms ksa ksb ksc kse ksh ksk ksm kss maa mab mac mae mah mak mam mas mba mbb mbc mbe mbh mbk mbm mbs mc- mca mcb mcc mce mch mck mcm mcs mea meb mec mee meh mek mem mes mha mhc mhh mhk mhm mhs mka mkb mkc mke mkh mkk mkm mks mma mmb mmc mme mmh mmk mmm mms msa msb msc mse msh msk msm mss saa sab sac sae sah sak sam sas sba sbb sbc sbe sbh sbk sbm sbs sca scb scc sce sch sck scm scs se- sea seb sec see seh sek sem ses sh- sha shb shc she shh shk shm shs sk- ska skb skc ske skh skk skm sks sma smb smc sme smh smk smm sms ss- ssa ssb ssc sse ssh ssk ssm sss