a-a aaa aaf aag aan aar aas af- afa aff afg afn afr afs ag- aga agf agg agn agr ags an- ana anf ang ann anr ans ar- ara arf arg arn arr ars as- asa asf asg asn asr ass faa faf fag fan far fas ffa fff ffg ffn ffr ffs fga fgf fgg fgn fgr fgs fna fnf fng fnn fnr fns fra frf frg frn frr frs fsa fsf fsg fsn fsr fss gaa gaf gag gan gar gas gfa gff gfr gfs gga ggg ggn ggr ggs gna gnf gnn gnr gns gra grf grg grn grr grs gsa gsf gsg gsn gsr gss naa naf nag nan nar nas nfa nff nfn nfr nfs nga ngf ngg ngn ngs nna nnf nng nnn nns nra nrf nrg nrn nrr nrs nsa nsf nsg nsn nsr nss ra- raa raf rag ran rar ras rfa rff rfg rfn rfr rfs rga rgf rgg rgn rgr rgs rna rng rnn rnr rns rra rrf rrg rrn rrr rrs rsa rsf rsg rsn rsr rss saa saf sag san sar sas sfa sff sfg sfn sfr sfs sga sgf sgg sgn sgr sgs sna snf sng snn snr sns sr- sra srf srg srn srr srs ss- ssa ssf ssg ssn ssr sss