a-a a-b aaa aab aae aah aak aas ab- aba abb abe abh abk abs aea aeb aee aeh aek aes aha ahb ahe ahh ahk ahs aka akb ake akh akk aks as- asa asb ase ash ask ass baa bab bae bah bak bas bba bbb bbe bbh bbk bbs be- bea beb bee beh bek bes bha bhb bhe bhh bhk bhs bka bkb bke bkk bks bsa bsb bse bsh bsk bss eaa eab eae eah eak eas eba ebb ebe ebh ebk ebs eea eeb eee eek ees eha ehb ehe ehh ehs eka ekb eke ekh eks es- esa esb ese esh esk ess haa hab hae hah hak has hba hbb hbe hbh hbk hbs he- hea heb hee heh hek hes hha hhb hhe hhh hhk hhs hka hkb hkh hkk hks hsa hsb hse hsh hsk hss ka- kaa kab kae kah kak kas kba kbb kbe kbh kbk kbs ke- kea keb kee keh kek kes kha khe khh khk khs kkb kke kkh kkk kks ksa ksb kse ksh ksk kss saa sab sae sah sak sas sba sbb sbe sbh sbk sbs se- sea seb see seh sek ses sh- sha shb she shh shk shs sk- ska skb ske skh skk sks ss- ssa ssb sse ssh ssk sss