-er a-a a-b aaa aab aae aaj aan aao aar aas ab- aba abb abe abj abn abo abr abs aea aeb aee aej aen aeo aer aes aja ajb aje ajj ajn ajo ajr ajs an- ana anb ane anj ann ano anr ans aoa aob aoe aoj aon aoo aor aos ar- ara arb are arj arn aro arr ars as- asa asb ase asj asn aso asr ass baa bab bae baj ban bao bar bas bba bbb bbe bbn bbo bbr bbs be- bea beb bee ben beo ber bes bja bjj bjn bjr bjs bna bnb bne bnj bnn bno bnr bns boa bob boe boj bon boo bor bos bra brb bre brj brn bro brr brs bsa bsb bse bsj bsn bso bsr bss eaa eab eae eaj ean eao ear eas eba ebb ebe ebj ebn ebo ebr ebs eea eeb eee een eeo eer ees eja ejo en- ena enb ene enn eno enr ens eo- eoa eob eoe eon eoo eor eos era erb ere ern ero err ers es- esa esb ese esn eso esr ess jaa jab jae jaj jan jao jar jas jba jbj jbo jbr jbs jea jeb jee jej jen jeo jer jes jja jjb jjj jjr jjs jna jne jnj jnn jno jnr jns joa job joe joj jon joo jor jos jra jrb jrn jro jrr jrs jsa jsb jse jsj jsn jso jsr jss naa nab nae naj nan nao nar nas nba nbb nbe nbn nbo nbr nbs ne- nea neb nee nej nen neo ner nes nja nje njn njs nna nnb nne nnn nno nns no- noa nob noe noj non noo nor nos nra nrb nre nrj nrn nro nrr nrs nsa nsb nse nsn nso nsr nss oaa oab oae oaj oan oao oar oas ob- oba obb obe obj obn obo obr obs oea oeb oee oen oeo oer oes oja ojb oje ojo ojs on- ona onb one onj onn ono onr ons oo- ooa oob oon ooo oor oos or- ora orb ore orn oro orr ors os- osa osb ose osj osn oso osr oss ra- raa rab rae raj ran rao rar ras rba rbb rbe rbn rbo rbr rbs re- rea reb ree ren reo rer res rja rjr rna rnb rnn rno rnr rns roa rob roe roj ron roo ror ros rra rrb rrn rrr rrs rsa rsb rse rsj rsn rso rsr rss saa sab sae saj san sao sar sas sba sbb sbe sbj sbn sbo sbr sbs se- sea seb see sej sen seo ser ses sja sjb sje sjj sjr sjs sna snb sne snj snn sno snr sns soa sob soe soj son soo sor sos sr- sra srb sre srj srn sro srr srs ss- ssa ssb sse ssj ssn sso ssr sss