a-a a-b aaa aab aaj aak aan aao aas ab- aba abb abj abk abn abo abs aja ajb ajj ajk ajn ajo ajs aka akb akj akk akn ako aks an- ana anb anj ank ann ano ans aoa aob aoj aok aon aoo aos as- asa asb asj ask asn aso ass baa bab baj bak ban bao bas bba bbb bbk bbn bbo bbs bja bjj bjk bjn bjs bka bkb bkk bkn bko bks bna bnb bnj bnk bnn bno bns boa bob boj bok bon boo bos bsa bsb bsj bsk bsn bso bss jaa jab jaj jak jan jao jas jba jbj jbk jbo jbs jja jjb jjj jjk jjs jka jkb jkk jkn jko jks jna jnj jnn jno jns joa job joj jok jon joo jos jsa jsb jsj jsk jsn jso jss ka- kaa kab kaj kak kan kao kas kba kbb kbk kbn kbo kbs kjb kjs kkb kkk kkn kks kn- kna knk knn kno koa kob kok kon koo kos ksa ksb ksk ksn kso kss naa nab naj nak nan nao nas nba nbb nbk nbn nbo nbs nja njk njn njs nka nkj nkk nkn nko nks nna nnb nnk nnn nno nns no- noa nob noj nok non noo nos nsa nsb nsk nsn nso nss oaa oab oaj oak oan oao oas ob- oba obb obj obk obn obo obs oja ojb ojo ojs oka okb okj okk oko oks on- ona onb onj onk onn ono ons oo- ooa oob ook oon ooo oos os- osa osb osj osk osn oso oss saa sab saj sak san sao sas sba sbb sbj sbk sbn sbo sbs sja sjb sjj sjk sjs sk- ska skb skj skk sko sks sna snb snj snk snn sno sns soa sob soj sok son soo sos ss- ssa ssb ssj ssk ssn sso sss