a-a a-b aaa aab aae aaj aak aan aao aas ab- aba abb abe abj abk abn abo abs aea aeb aee aej aek aen aeo aes aja ajb aje ajj ajk ajn ajo ajs aka akb ake akj akk akn ako aks an- ana anb ane anj ank ann ano ans aoa aob aoe aoj aok aon aoo aos as- asa asb ase asj ask asn aso ass baa bab bae baj bak ban bao bas bba bbb bbe bbk bbn bbo bbs be- bea beb bee bek ben beo bes bja bjj bjk bjn bjs bka bkb bke bkk bkn bko bks bna bnb bne bnj bnk bnn bno bns boa bob boe boj bok bon boo bos bsa bsb bse bsj bsk bsn bso bss eaa eab eae eaj eak ean eao eas eba ebb ebe ebj ebk ebn ebo ebs eea eeb eee eek een eeo ees eja ejo eka ekb eke eko eks en- ena enb ene enk enn eno ens eo- eoa eob eoe eok eon eoo eos es- esa esb ese esk esn eso ess jaa jab jae jaj jak jan jao jas jba jbj jbk jbo jbs jea jeb jee jej jek jen jeo jes jja jjb jjj jjk jjs jka jkb jkk jkn jko jks jna jne jnj jnn jno jns joa job joe joj jok jon joo jos jsa jsb jse jsj jsk jsn jso jss ka- kaa kab kae kaj kak kan kao kas kba kbb kbe kbk kbn kbo kbs ke- kea keb kee kek ken keo kes kjb kje kjs kkb kke kkk kkn kks kn- kna kne knk knn kno koa kob koe kok kon koo kos ksa ksb kse ksk ksn kso kss naa nab nae naj nak nan nao nas nba nbb nbe nbk nbn nbo nbs ne- nea neb nee nej nek nen neo nes nja nje njk njn njs nka nke nkj nkk nkn nko nks nna nnb nne nnk nnn nno nns no- noa nob noe noj nok non noo nos nsa nsb nse nsk nsn nso nss oaa oab oae oaj oak oan oao oas ob- oba obb obe obj obk obn obo obs oea oeb oee oen oeo oes oja ojb oje ojo ojs oka okb oke okj okk oko oks on- ona onb one onj onk onn ono ons oo- ooa oob ook oon ooo oos os- osa osb ose osj osk osn oso oss saa sab sae saj sak san sao sas sba sbb sbe sbj sbk sbn sbo sbs se- sea seb see sej sek sen seo ses sja sjb sje sjj sjk sjs sk- ska skb ske skj skk sko sks sna snb sne snj snk snn sno sns soa sob soe soj sok son soo sos ss- ssa ssb sse ssj ssk ssn sso sss