a-a a-c aaa aac aae aaf aag aan aao aas ac- aca acc ace acf acg acn aco acs aea aec aee aef aeg aen aeo aes af- afa afc afe aff afg afn afo afs ag- aga agc age agf agg agn ago ags an- ana anc ane anf ang ann ano ans aoa aoc aoe aof aog aon aoo aos as- asa asc ase asf asg asn aso ass c-- caa cac cae caf cag can cao cas cca ccc cce ccf ccg ccn cco ccs ce- cea cec cee cef ceg cen ceo ces cfa cfc cfe cff cfg cfn cfo cfs cga cgc cge cgg cgn cgo cgs cn- cna cnc cne cnf cng cnn cno cns co- coa coc coe cof cog con coo cos csa csc cse csf csg csn cso css eaa eac eae eaf eag ean eao eas ec- eca ecc ece ecf ecg ecn eco ecs eea eec eee eef eeg een eeo ees ef- efa efc efe eff efg efo efs ega egc ege egf egg egn ego egs en- ena enc ene enf eng enn eno ens eo- eoa eoc eoe eof eog eon eoo eos es- esa esc ese esf esg esn eso ess faa fac fae faf fag fan fao fas fca fcc fce fcf fcg fcn fco fcs fea fec fee fef feg fen feo fes ffa ffc ffe fff ffg ffn ffo ffs fga fgc fge fgf fgg fgn fgs fna fnc fne fnf fng fnn fns foa foc foe fof fog fon foo fos fsa fsc fse fsf fsg fsn fso fss gaa gac gae gaf gag gan gao gas gca gcc gce gcf gcg gcn gco gcs ge- gea gec gee gef geg gen geo ges gfa gfc gfe gff gfo gfs gga ggc ggg ggn ggo ggs gna gnc gne gnf gnn gno gns goa goc goe gof gog gon goo gos gsa gsc gse gsf gsg gsn gso gss naa nac nae naf nag nan nao nas nca ncc nce ncf ncg ncn nco ncs ne- nea nec nee nef neg nen neo nes nfa nfc nfe nff nfn nfo nfs nga ngc nge ngf ngg ngn ngo ngs nna nnc nne nnf nng nnn nno nns no- noa noc noe nof nog non noo nos nsa nsc nse nsf nsg nsn nso nss oaa oac oae oaf oag oan oao oas oc- oca occ ocf ocg ocn oco ocs oea oec oee oef oeg oen oeo oes of- ofa ofc ofe off ofg ofn ofo ofs oga ogc oge ogf ogg ogn ogo ogs on- ona onc one onf ong onn ono ons oo- ooa ooc oof oog oon ooo oos os- osa osc ose osf osg osn oso oss saa sac sae saf sag san sao sas sca scc sce scf scg scn sco scs se- sea sec see sef seg sen seo ses sfa sfc sfe sff sfg sfn sfo sfs sga sgc sge sgf sgg sgn sgo sgs sna snc sne snf sng snn sno sns soa soc soe sof sog son soo sos ss- ssa ssc sse ssf ssg ssn sso sss