a-a a-b a-i aaa aab aag aai aan aar aas aax ab- aba abb abg abi abn abr abs abx ag- aga agb agg agi agn agr ags agx ai- aia aib aig aii ain air ais aix an- ana anb ang ani ann anr ans anx ar- ara arb arg ari arn arr ars arx as- asa asb asg asi asn asr ass asx ax- axa axi axn axr axs axx baa bab bag bai ban bar bas bax bba bbb bbg bbi bbn bbr bbs bbx bga bgb bgg bgi bgn bgr bgs bgx bi- bia bib big bii bin bir bis bix bna bnb bng bni bnn bnr bns bnx bra brb brg bri brn brr brs brx bsa bsb bsg bsi bsn bsr bss bsx bxb bxi bxn bxx gaa gab gag gai gan gar gas gba gbg gbi gbn gbr gbs gbx gga ggb ggg ggi ggn ggr ggs gia gib gig gii gin gir gis gna gnb gni gnn gnr gns gra grb grg gri grn grr grs grx gsa gsb gsg gsi gsn gsr gss gsx gxa gxs ia- iaa iab iag iai ian iar ias iba ibb ibg ibi ibn ibr ibs ibx iga igb igg igi ign igr igs iia iib iii iin iir iis iix in- ina inb ing ini inn inr ins inx ir- ira irb irg iri irn irr irs irx is- isa isb isg isi isn isr iss ixi ixn n-i naa nab nag nai nan nar nas nax nba nbb nbg nbi nbn nbr nbs nbx nga ngb ngg ngi ngn ngs nia nib nig nii nin nir nis nix nna nnb nng nni nnn nns nra nrb nrg nri nrn nrr nrs nrx nsa nsb nsg nsi nsn nsr nss nsx ra- raa rab rag rai ran rar ras rax rba rbb rbg rbi rbn rbr rbs rbx rga rgb rgg rgi rgn rgr rgs rgx ria rib rig rii rin rir ris rix rna rnb rng rni rnn rnr rns rra rrb rrg rri rrn rrr rrs rsa rsb rsg rsi rsn rsr rss rsx rxr rxs saa sab sag sai san sar sas sax sba sbb sbg sbi sbn sbr sbs sbx sga sgb sgg sgi sgn sgr sgs sgx sia sib sig sii sin sir sis six sna snb sng sni snn snr sns sr- sra srb srg sri srn srr srs srx ss- ssa ssb ssg ssi ssn ssr sss ssx sxi sxn sxs xaa xag xan xar xas xbr xbx xgi xia xii xin xis xix xna xns xrx xsa xsb xsi xss xxi xxx