a-a a-b a-c aaa aab aac aae aag aah aan aas ab- aba abb abc abe abg abh abn abs ac- aca acb acc ace acg ach acn acs aea aeb aec aee aeg aeh aen aes ag- aga agb agc age agg agh agn ags aha ahb ahc ahe ahg ahh ahn ahs an- ana anb anc ane ang anh ann ans as- asa asb asc ase asg ash asn ass baa bab bac bae bag bah ban bas bba bbb bbc bbe bbg bbh bbn bbs bca bcb bcc bce bcg bch bcn bcs be- bea beb bec bee beg beh ben bes bga bgb bgc bge bgg bgh bgn bgs bha bhb bhc bhe bhg bhh bhs bna bnb bnc bne bng bnn bns bsa bsb bsc bse bsg bsh bsn bss c-- caa cab cac cae cag cah can cas cba cbb cbc cbe cbg cbh cbn cbs cca ccb ccc cce ccg cch ccn ccs ce- cea ceb cec cee ceg ceh cen ces cga cgb cgc cge cgg cgh cgn cgs ch- cha chb chc che chg chh chn chs cn- cna cnb cnc cne cng cnh cnn cns csa csb csc cse csg csh csn css eaa eab eac eae eag eah ean eas eba ebb ebc ebe ebg ebh ebn ebs ec- eca ecb ecc ece ecg ech ecn ecs eea eeb eec eee eeg een ees ega egb egc ege egg egh egn egs eha ehb ehc ehe ehg ehh ehn ehs en- ena enb enc ene eng enh enn ens es- esa esb esc ese esg esh esn ess gaa gab gac gae gag gah gan gas gba gbc gbe gbg gbh gbn gbs gca gcb gcc gce gcg gch gcn gcs ge- gea geb gec gee geg geh gen ges gga ggb ggc ggg ggh ggn ggs gha ghb ghc ghe ghg ghh ghn ghs gna gnb gnc gne gnn gns gsa gsb gsc gse gsg gsn gss haa hab hac hae hag hah han has hba hbb hbc hbe hbg hbh hbn hbs hca hcb hcc hce hcg hch hcn hcs he- hea heb hec hee heg heh hen hes hga hgb hgc hge hgg hgh hgn hgs hha hhb hhc hhe hhg hhh hhn hhs hna hnb hnc hne hng hnh hnn hns hsa hsb hsc hse hsg hsh hsn hss naa nab nac nae nag nah nan nas nba nbb nbc nbe nbg nbn nbs nca ncb ncc nce ncg nch ncn ncs ne- nea neb nec nee neg neh nen nes nga ngb ngc nge ngg ngh ngn ngs nha nhb nhc nhe nhg nhh nhn nhs nna nnb nnc nne nng nnh nnn nns nsa nsb nsc nse nsg nsh nsn nss saa sab sac sae sag sah san sas sba sbb sbc sbe sbg sbh sbn sbs sca scb scc sce scg sch scn scs se- sea seb sec see seg seh sen ses sga sgb sgc sge sgg sgh sgn sgs sh- sha shb shc she shg shh shn shs sna snb snc sne sng snn sns ss- ssa ssb ssc sse ssg ssh ssn sss