a-a a-b a-i aaa aab aag aai aak aan aar aas ab- aba abb abg abi abk abn abr abs ag- aga agb agg agi agk agn agr ags ai- aia aib aig aii aik ain air ais aka akb akg aki akk akn akr aks an- ana anb ang ani ank ann anr ans ar- ara arb arg ari ark arn arr ars as- asa asb asg asi ask asn asr ass baa bab bag bai bak ban bar bas bba bbb bbg bbi bbk bbn bbr bbs bga bgb bgg bgi bgk bgn bgr bgs bi- bia bib big bii bik bin bir bis bka bkb bkg bkk bkn bkr bks bna bnb bng bni bnk bnn bnr bns bra brb brg bri brk brn brr brs bsa bsb bsg bsi bsk bsn bsr bss gaa gab gag gai gak gan gar gas gba gbg gbi gbk gbn gbr gbs gga ggb ggg ggi ggn ggr ggs gia gib gig gii gik gin gir gis gka gkb gkn gks gna gnb gni gnn gnr gns gra grb grg gri grk grn grr grs gsa gsb gsg gsi gsk gsn gsr gss ia- iaa iab iag iai ian iar ias iba ibb ibg ibi ibk ibn ibr ibs iga igb igg igi igk ign igr igs iia iib iii iin iir iis ika ikb iki ikk ikr iks in- ina inb ing ini ink inn inr ins ir- ira irb irg iri irk irn irr irs is- isa isb isg isi isk isn isr iss ka- kaa kab kag kai kak kan kar kas kba kbb kbi kbk kbn kbr kbs kga kgb kgi kgs kia kib kig kii kik kin kir kis kkb kki kkk kkn kkr kks kn- kna kng kni knk knn knr kra krg kri krk krn krr krs ksa ksb ksg ksi ksk ksn ksr kss n-i naa nab nag nai nak nan nar nas nba nbb nbg nbi nbk nbn nbr nbs nga ngb ngg ngi ngk ngn ngs nia nib nig nii nik nin nir nis nka nki nkk nkn nkr nks nna nnb nng nni nnk nnn nns nra nrb nrg nri nrk nrn nrr nrs nsa nsb nsg nsi nsk nsn nsr nss ra- raa rab rag rai rak ran rar ras rba rbb rbg rbi rbk rbn rbr rbs rga rgb rgg rgi rgk rgn rgr rgs ria rib rig rii rik rin rir ris rkb rkg rkk rks rna rnb rng rni rnn rnr rns rra rrb rrg rri rrk rrn rrr rrs rsa rsb rsg rsi rsk rsn rsr rss saa sab sag sai sak san sar sas sba sbb sbg sbi sbk sbn sbr sbs sga sgb sgg sgi sgk sgn sgr sgs sia sib sig sii sik sin sir sis sk- ska skb skg ski skk skr sks sna snb sng sni snk snn snr sns sr- sra srb srg sri srk srn srr srs ss- ssa ssb ssg ssi ssk ssn ssr sss