-er a-a a-b aaa aab aae aaj aao aar aas ab- aba abb abe abj abo abr abs aea aeb aee aej aeo aer aes aja ajb aje ajj ajo ajr ajs aoa aob aoe aoj aoo aor aos ar- ara arb are arj aro arr ars as- asa asb ase asj aso asr ass baa bab bae baj bao bar bas bba bbb bbe bbo bbr bbs be- bea beb bee beo ber bes bja bjj bjr bjs boa bob boe boj boo bor bos bra brb bre brj bro brr brs bsa bsb bse bsj bso bsr bss eaa eab eae eaj eao ear eas eba ebb ebe ebj ebo ebr ebs eea eeb eee eeo eer ees eja ejo eo- eoa eob eoe eoo eor eos era erb ere ero err ers es- esa esb ese eso esr ess jaa jab jae jaj jao jar jas jba jbj jbo jbr jbs jea jeb jee jej jeo jer jes jja jjb jjj jjr jjs joa job joe joj joo jor jos jra jrb jro jrr jrs jsa jsb jse jsj jso jsr jss oaa oab oae oaj oao oar oas ob- oba obb obe obj obo obr obs oea oeb oee oeo oer oes oja ojb oje ojo ojs oo- ooa oob ooo oor oos or- ora orb ore oro orr ors os- osa osb ose osj oso osr oss ra- raa rab rae raj rao rar ras rba rbb rbe rbo rbr rbs re- rea reb ree reo rer res rja rjr roa rob roe roj roo ror ros rra rrb rrr rrs rsa rsb rse rsj rso rsr rss saa sab sae saj sao sar sas sba sbb sbe sbj sbo sbr sbs se- sea seb see sej seo ser ses sja sjb sje sjj sjr sjs soa sob soe soj soo sor sos sr- sra srb sre srj sro srr srs ss- ssa ssb sse ssj sso ssr sss