a-a a-b a-c aaa aab aac aad aae aah aak aas ab- aba abb abc abd abe abh abk abs ac- aca acb acc acd ace ach ack acs ad- ada adb adc add ade adh adk ads aea aeb aec aed aee aeh aek aes aha ahb ahc ahd ahe ahh ahk ahs aka akb akc akd ake akh akk aks as- asa asb asc asd ase ash ask ass baa bab bac bad bae bah bak bas bba bbb bbc bbd bbe bbh bbk bbs bca bcb bcc bcd bce bch bck bcs bda bdb bdc bdd bde bdh bdk bds be- bea beb bec bed bee beh bek bes bha bhb bhc bhd bhe bhh bhk bhs bka bkb bkc bke bkk bks bsa bsb bsc bsd bse bsh bsk bss c-- caa cab cac cad cae cah cak cas cba cbb cbc cbd cbe cbh cbk cbs cca ccb ccc ccd cce cch cck ccs cda cdb cdc cdd cde cdh cdk cds ce- cea ceb cec ced cee ceh cek ces ch- cha chb chc chd che chh chk chs cka ckb ckc ckd ckh cks csa csb csc csd cse csh csk css daa dab dac dad dae dah dak das dba dbb dbc dbd dbe dbh dbk dbs dca dcb dcc dcd dce dck dcs dda ddb ddc ddd dde ddh ddk dds de- dea deb dec ded dee deh dek des dh- dha dhb dhc dhd dhe dhh dhk dhs dka dkb dkc dke dkk dks dsa dsb dsc dsd dse dsh dsk dss eaa eab eac ead eae eah eak eas eba ebb ebc ebd ebe ebh ebk ebs ec- eca ecb ecc ecd ece ech eck ecs ed- eda edb edc edd ede edh edk eds eea eeb eec eed eee eek ees eha ehb ehc ehd ehe ehh ehs eka ekb ekc ekd eke ekh eks es- esa esb esc esd ese esh esk ess haa hab hac had hae hah hak has hba hbb hbc hbd hbe hbh hbk hbs hca hcb hcc hcd hce hch hck hcs hda hdb hdc hdd hde hdh hdk hds he- hea heb hec hed hee heh hek hes hha hhb hhc hhd hhe hhh hhk hhs hka hkb hkd hkh hkk hks hsa hsb hsc hsd hse hsh hsk hss ka- kaa kab kac kad kae kah kak kas kba kbb kbc kbd kbe kbh kbk kbs kca kcb kcc kcd kce kch kck kcs kda kdb kdc kde kdh kdk kds ke- kea keb kec ked kee keh kek kes kha khe khh khk khs kkb kkc kke kkh kkk kks ksa ksb ksc ksd kse ksh ksk kss saa sab sac sad sae sah sak sas sba sbb sbc sbd sbe sbh sbk sbs sca scb scc scd sce sch sck scs sda sdb sdc sdd sde sdh sdk sds se- sea seb sec sed see seh sek ses sh- sha shb shc shd she shh shk shs sk- ska skb skc skd ske skh skk sks ss- ssa ssb ssc ssd sse ssh ssk sss