a-a a-b a-c aaa aab aac aae aah aas ab- aba abb abc abe abh abs ac- aca acb acc ace ach acs aea aeb aec aee aeh aes aha ahb ahc ahe ahh ahs as- asa asb asc ase ash ass baa bab bac bae bah bas bba bbb bbc bbe bbh bbs bca bcb bcc bce bch bcs be- bea beb bec bee beh bes bha bhb bhc bhe bhh bhs bsa bsb bsc bse bsh bss c-- caa cab cac cae cah cas cba cbb cbc cbe cbh cbs cca ccb ccc cce cch ccs ce- cea ceb cec cee ceh ces ch- cha chb chc che chh chs csa csb csc cse csh css eaa eab eac eae eah eas eba ebb ebc ebe ebh ebs ec- eca ecb ecc ece ech ecs eea eeb eec eee ees eha ehb ehc ehe ehh ehs es- esa esb esc ese esh ess haa hab hac hae hah has hba hbb hbc hbe hbh hbs hca hcb hcc hce hch hcs he- hea heb hec hee heh hes hha hhb hhc hhe hhh hhs hsa hsb hsc hse hsh hss saa sab sac sae sah sas sba sbb sbc sbe sbh sbs sca scb scc sce sch scs se- sea seb sec see seh ses sh- sha shb shc she shh shs ss- ssa ssb ssc sse ssh sss