a-a a-b a-c aaa aab aac aad aae aak aam aas ab- aba abb abc abd abe abk abm abs ac- aca acb acc acd ace ack acm acs ad- ada adb adc add ade adk adm ads aea aeb aec aed aee aek aem aes aka akb akc akd ake akk akm aks ama amb amc amd ame amk amm ams as- asa asb asc asd ase ask asm ass baa bab bac bad bae bak bam bas bba bbb bbc bbd bbe bbk bbm bbs bca bcb bcc bcd bce bck bcm bcs bda bdb bdc bdd bde bdk bdm bds be- bea beb bec bed bee bek bem bes bka bkb bkc bke bkk bkm bks bma bmb bmc bmd bme bmk bmm bms bsa bsb bsc bsd bse bsk bsm bss c-- caa cab cac cad cae cak cam cas cba cbb cbc cbd cbe cbk cbm cbs cca ccb ccc ccd cce cck ccm ccs cda cdb cdc cdd cde cdk cdm cds ce- cea ceb cec ced cee cek cem ces cka ckb ckc ckd ckm cks cma cmb cmc cmd cme cmk cmm cms csa csb csc csd cse csk csm css daa dab dac dad dae dak dam das dba dbb dbc dbd dbe dbk dbm dbs dca dcb dcc dcd dce dck dcm dcs dda ddb ddc ddd dde ddk ddm dds de- dea deb dec ded dee dek dem des dka dkb dkc dke dkk dkm dks dma dmb dmc dmd dme dmk dmm dms dsa dsb dsc dsd dse dsk dsm dss eaa eab eac ead eae eak eam eas eba ebb ebc ebd ebe ebk ebm ebs ec- eca ecb ecc ecd ece eck ecm ecs ed- eda edb edc edd ede edk edm eds eea eeb eec eed eee eek eem ees eka ekb ekc ekd eke eks em- ema emb emc emd eme emk emm ems es- esa esb esc esd ese esk esm ess ka- kaa kab kac kad kae kak kam kas kba kbb kbc kbd kbe kbk kbm kbs kca kcb kcc kcd kce kck kcm kcs kda kdb kdc kde kdk kdm kds ke- kea keb kec ked kee kek kem kes kkb kkc kke kkk kkm kks kma kmb kmc kmd kme kmk kmm kms ksa ksb ksc ksd kse ksk ksm kss maa mab mac mad mae mak mam mas mba mbb mbc mbd mbe mbk mbm mbs mc- mca mcb mcc mcd mce mck mcm mcs mda mdb mdc mdd mde mdk mdm mds mea meb mec med mee mek mem mes mka mkb mkc mkd mke mkk mkm mks mma mmb mmc mmd mme mmk mmm mms msa msb msc msd mse msk msm mss saa sab sac sad sae sak sam sas sba sbb sbc sbd sbe sbk sbm sbs sca scb scc scd sce sck scm scs sda sdb sdc sdd sde sdk sdm sds se- sea seb sec sed see sek sem ses sk- ska skb skc skd ske skk skm sks sma smb smc smd sme smk smm sms ss- ssa ssb ssc ssd sse ssk ssm sss