a-a aaa aaf aag aan aao aar aas af- afa aff afg afn afo afr afs ag- aga agf agg agn ago agr ags an- ana anf ang ann ano anr ans aoa aof aog aon aoo aor aos ar- ara arf arg arn aro arr ars as- asa asf asg asn aso asr ass faa faf fag fan fao far fas ffa fff ffg ffn ffo ffr ffs fga fgf fgg fgn fgr fgs fna fnf fng fnn fnr fns foa fof fog fon foo for fos fra frf frg frn fro frr frs fsa fsf fsg fsn fso fsr fss gaa gaf gag gan gao gar gas gfa gff gfo gfr gfs gga ggg ggn ggo ggr ggs gna gnf gnn gno gnr gns goa gof gog gon goo gor gos gra grf grg grn gro grr grs gsa gsf gsg gsn gso gsr gss naa naf nag nan nao nar nas nfa nff nfn nfo nfr nfs nga ngf ngg ngn ngo ngs nna nnf nng nnn nno nns no- noa nof nog non noo nor nos nra nrf nrg nrn nro nrr nrs nsa nsf nsg nsn nso nsr nss oaa oaf oag oan oao oar oas of- ofa off ofg ofn ofo ofr ofs oga ogf ogg ogn ogo ogs on- ona onf ong onn ono onr ons oo- ooa oof oog oon ooo oor oos or- ora orf org orn oro orr ors os- osa osf osg osn oso osr oss ra- raa raf rag ran rao rar ras rfa rff rfg rfn rfo rfr rfs rga rgf rgg rgn rgo rgr rgs rna rng rnn rno rnr rns roa rof rog ron roo ror ros rra rrf rrg rrn rrr rrs rsa rsf rsg rsn rso rsr rss saa saf sag san sao sar sas sfa sff sfg sfn sfo sfr sfs sga sgf sgg sgn sgo sgr sgs sna snf sng snn sno snr sns soa sof sog son soo sor sos sr- sra srf srg srn sro srr srs ss- ssa ssf ssg ssn sso ssr sss