a-a a-b aaa aab aae aaj aak aas ab- aba abb abe abj abk abs aea aeb aee aej aek aes aja ajb aje ajj ajk ajs aka akb ake akj akk aks as- asa asb ase asj ask ass baa bab bae baj bak bas bba bbb bbe bbk bbs be- bea beb bee bek bes bja bjj bjk bjs bka bkb bke bkk bks bsa bsb bse bsj bsk bss eaa eab eae eaj eak eas eba ebb ebe ebj ebk ebs eea eeb eee eek ees eja eka ekb eke eks es- esa esb ese esk ess jaa jab jae jaj jak jas jba jbj jbk jbs jea jeb jee jej jek jes jja jjb jjj jjk jjs jka jkb jkk jks jsa jsb jse jsj jsk jss ka- kaa kab kae kaj kak kas kba kbb kbe kbk kbs ke- kea keb kee kek kes kjb kje kjs kkb kke kkk kks ksa ksb kse ksk kss saa sab sae saj sak sas sba sbb sbe sbj sbk sbs se- sea seb see sej sek ses sja sjb sje sjj sjk sjs sk- ska skb ske skj skk sks ss- ssa ssb sse ssj ssk sss