a-a a-i aaa aaf aag aai aao aar aas aau aax af- afa aff afg afi afo afr afs afu afx ag- aga agf agg agi ago agr ags agu agx ai- aia aif aig aii aio air ais aiu aix aoa aof aog aoi aoo aor aos aou aox ar- ara arf arg ari aro arr ars aru arx as- asa asf asg asi aso asr ass asu asx au- aua auf aug aui auo aur aus aux ax- axa axi axo axr axs axx faa faf fag fai fao far fas fau fax ffa fff ffg ffi ffo ffr ffs ffu ffx fga fgf fgg fgi fgr fgs fia fif fig fii fir fis fiu fix foa fof fog foi foo for fos fou fox fra frf frg fri fro frr frs fru fsa fsf fsg fsi fso fsr fss fsu fsx fua fuf fug fui fuo fur fus fuu fux fxg fxi fxr fxs fxu fxx gaa gaf gag gai gao gar gas gau gfa gff gfi gfo gfr gfs gfx gga ggg ggi ggo ggr ggs ggu gia gif gig gii gio gir gis giu goa gof gog goi goo gor gos gou gox gra grf grg gri gro grr grs gru grx gsa gsf gsg gsi gso gsr gss gsu gsx gu- gua guf gug gui guo gur gus guu gxa gxf gxs i-f ia- iaa iaf iag iai iao iar ias iau ifa iff ifg ifi ifo ifr ifs ifu ifx iga igf igg igi igo igr igs igu iia iif iii iio iir iis iiu iix io- ioa iof iog ioi ioo ior ios iou ir- ira irf irg iri iro irr irs iru irx is- isa isf isg isi iso isr iss isu iu- iua iug iui iur ius ixi o-i oaa oaf oag oai oao oar oas oau oax of- ofa off ofg ofi ofo ofr ofs ofu ofx oga ogf ogg ogi ogo ogs ogx oia oif oii oio oir ois oiu oo- ooa oof oog ooi ooo oor oos oox or- ora orf org ori oro orr ors oru orx os- osa osf osg osi oso osr oss osu osx ou- oua ouf oui ouo our ous ox- oxa oxf oxi oxo oxx ra- raa raf rag rai rao rar ras rau rax rfa rff rfg rfi rfo rfr rfs rfu rga rgf rgg rgi rgo rgr rgs rgx ria rif rig rii rio rir ris rix roa rof rog roi roo ror ros rou rox rra rrf rrg rri rrr rrs rru rsa rsf rsg rsi rso rsr rss rsu rsx rua ruf rug rui ruo rur rus ruu rux rxr rxs saa saf sag sai sao sar sas sau sax sfa sff sfg sfi sfo sfr sfs sfu sfx sga sgf sgg sgi sgo sgr sgs sgu sgx sia sif sig sii sio sir sis siu six soa sof sog soi soo sor sos sou sox sr- sra srf srg sri sro srr srs srx ss- ssa ssf ssg ssi sso ssr sss ssu ssx sua suf sug sui suo sur sus suu sux sxi sxs sxu ua- uaa uaf uag uai uao uar uas uau ufa uff ufg ufi ufo ufr ufs ufu ufx uga ugf ugg ugi ugo ugr ugs ugu ugx uia uif uig uii uio uir uis uiu uoa uog uoo uor uos uox ur- ura urf urg uri uro urr urs uru urx usa usf usg usi uso usr uss usu usx uua uug uur uus uuu uxf uxo uxr uxu xaa xaf xag xar xas xau xfa xfs xfx xgi xia xii xio xis xiu xix xoa xof xog xoi xoo xor xos xox xrf xrx xsa xsi xss xui xus xxi xxo xxx