a-a a-b aaa aab aaj aan aao aar aas ab- aba abb abj abn abo abr abs aja ajb ajj ajn ajo ajr ajs an- ana anb anj ann ano anr ans aoa aob aoj aon aoo aor aos ar- ara arb arj arn aro arr ars as- asa asb asj asn aso asr ass baa bab baj ban bao bar bas bba bbb bbn bbo bbr bbs bja bjj bjn bjr bjs bna bnb bnj bnn bno bnr bns boa bob boj bon boo bor bos bra brb brj brn bro brr brs bsa bsb bsj bsn bso bsr bss jaa jab jaj jan jao jar jas jba jbj jbo jbr jbs jja jjb jjj jjr jjs jna jnj jnn jno jnr jns joa job joj jon joo jor jos jra jrb jrn jro jrr jrs jsa jsb jsj jsn jso jsr jss naa nab naj nan nao nar nas nba nbb nbn nbo nbr nbs nja njn njs nna nnb nnn nno nns no- noa nob noj non noo nor nos nra nrb nrj nrn nro nrr nrs nsa nsb nsn nso nsr nss oaa oab oaj oan oao oar oas ob- oba obb obj obn obo obr obs oja ojb ojo ojs on- ona onb onj onn ono onr ons oo- ooa oob oon ooo oor oos or- ora orb orn oro orr ors os- osa osb osj osn oso osr oss ra- raa rab raj ran rao rar ras rba rbb rbn rbo rbr rbs rja rjr rna rnb rnn rno rnr rns roa rob roj ron roo ror ros rra rrb rrn rrr rrs rsa rsb rsj rsn rso rsr rss saa sab saj san sao sar sas sba sbb sbj sbn sbo sbr sbs sja sjb sjj sjr sjs sna snb snj snn sno snr sns soa sob soj son soo sor sos sr- sra srb srj srn sro srr srs ss- ssa ssb ssj ssn sso ssr sss