a-a a-b aaa aab aae aag aaj aak aan aas ab- aba abb abe abg abj abk abn abs aea aeb aee aeg aej aek aen aes ag- aga agb age agg agj agk agn ags aja ajb aje ajj ajk ajn ajs aka akb ake akg akj akk akn aks an- ana anb ane ang anj ank ann ans as- asa asb ase asg asj ask asn ass baa bab bae bag baj bak ban bas bba bbb bbe bbg bbk bbn bbs be- bea beb bee beg bek ben bes bga bgb bge bgg bgk bgn bgs bja bjg bjj bjk bjn bjs bka bkb bke bkg bkk bkn bks bna bnb bne bng bnj bnk bnn bns bsa bsb bse bsg bsj bsk bsn bss eaa eab eae eag eaj eak ean eas eba ebb ebe ebg ebj ebk ebn ebs eea eeb eee eeg eek een ees ega egb ege egg egn egs eja eka ekb eke ekg eks en- ena enb ene eng enk enn ens es- esa esb ese esg esk esn ess gaa gab gae gag gaj gak gan gas gba gbe gbg gbj gbk gbn gbs ge- gea geb gee geg gek gen ges gga ggb ggg ggj ggn ggs gja gje gjg gka gkb gkn gks gna gnb gne gnn gns gsa gsb gse gsg gsj gsk gsn gss jaa jab jae jag jaj jak jan jas jba jbg jbj jbk jbs jea jeb jee jeg jej jek jen jes jga jgb jge jgn jgs jja jjb jjg jjj jjk jjs jka jkb jkk jkn jks jna jne jng jnj jnn jns jsa jsb jse jsg jsj jsk jsn jss ka- kaa kab kae kag kaj kak kan kas kba kbb kbe kbk kbn kbs ke- kea keb kee keg kek ken kes kga kgb kgs kjb kje kjs kkb kke kkk kkn kks kn- kna kne kng knk knn ksa ksb kse ksg ksk ksn kss naa nab nae nag naj nak nan nas nba nbb nbe nbg nbk nbn nbs ne- nea neb nee neg nej nek nen nes nga ngb nge ngg ngj ngk ngn ngs nja nje njk njn njs nka nke nkj nkk nkn nks nna nnb nne nng nnk nnn nns nsa nsb nse nsg nsk nsn nss saa sab sae sag saj sak san sas sba sbb sbe sbg sbj sbk sbn sbs se- sea seb see seg sej sek sen ses sga sgb sge sgg sgk sgn sgs sja sjb sje sjj sjk sjs sk- ska skb ske skg skj skk sks sna snb sne sng snj snk snn sns ss- ssa ssb sse ssg ssj ssk ssn sss