a-a a-i aaa aaf aag aai aar aas aax af- afa aff afg afi afr afs afx ag- aga agf agg agi agr ags agx ai- aia aif aig aii air ais aix ar- ara arf arg ari arr ars arx as- asa asf asg asi asr ass asx ax- axa axi axr axs axx faa faf fag fai far fas fax ffa fff ffg ffi ffr ffs ffx fga fgf fgg fgi fgr fgs fia fif fig fii fir fis fix fra frf frg fri frr frs fsa fsf fsg fsi fsr fss fsx fxg fxi fxr fxs fxx gaa gaf gag gai gar gas gfa gff gfi gfr gfs gfx gga ggg ggi ggr ggs gia gif gig gii gir gis gra grf grg gri grr grs grx gsa gsf gsg gsi gsr gss gsx gxa gxf gxs i-f ia- iaa iaf iag iai iar ias ifa iff ifg ifi ifr ifs ifx iga igf igg igi igr igs iia iif iii iir iis iix ir- ira irf irg iri irr irs irx is- isa isf isg isi isr iss ixi ra- raa raf rag rai rar ras rax rfa rff rfg rfi rfr rfs rga rgf rgg rgi rgr rgs rgx ria rif rig rii rir ris rix rra rrf rrg rri rrr rrs rsa rsf rsg rsi rsr rss rsx rxr rxs saa saf sag sai sar sas sax sfa sff sfg sfi sfr sfs sfx sga sgf sgg sgi sgr sgs sgx sia sif sig sii sir sis six sr- sra srf srg sri srr srs srx ss- ssa ssf ssg ssi ssr sss ssx sxi sxs xaa xaf xag xar xas xfa xfs xfx xgi xia xii xis xix xrf xrx xsa xsi xss xxi xxx