-er a-a a-b aaa aab aae aaj aak aar aas ab- aba abb abe abj abk abr abs aea aeb aee aej aek aer aes aja ajb aje ajj ajk ajr ajs aka akb ake akj akk akr aks ar- ara arb are arj ark arr ars as- asa asb ase asj ask asr ass baa bab bae baj bak bar bas bba bbb bbe bbk bbr bbs be- bea beb bee bek ber bes bja bjj bjk bjr bjs bka bkb bke bkk bkr bks bra brb bre brj brk brr brs bsa bsb bse bsj bsk bsr bss eaa eab eae eaj eak ear eas eba ebb ebe ebj ebk ebr ebs eea eeb eee eek eer ees eja eka ekb eke ekr eks era erb ere erk err ers es- esa esb ese esk esr ess jaa jab jae jaj jak jar jas jba jbj jbk jbr jbs jea jeb jee jej jek jer jes jja jjb jjj jjk jjr jjs jka jkb jkk jkr jks jra jrb jrk jrr jrs jsa jsb jse jsj jsk jsr jss ka- kaa kab kae kaj kak kar kas kba kbb kbe kbk kbr kbs ke- kea keb kee kek ker kes kjb kje kjr kjs kkb kke kkk kkr kks kra krk krr krs ksa ksb kse ksk ksr kss ra- raa rab rae raj rak rar ras rba rbb rbe rbk rbr rbs re- rea reb ree rek rer res rja rjk rjr rkb rke rkk rks rra rrb rrk rrr rrs rsa rsb rse rsj rsk rsr rss saa sab sae saj sak sar sas sba sbb sbe sbj sbk sbr sbs se- sea seb see sej sek ser ses sja sjb sje sjj sjk sjr sjs sk- ska skb ske skj skk skr sks sr- sra srb sre srj srk srr srs ss- ssa ssb sse ssj ssk ssr sss