a-a a-i aaa aaf aag aai aao aap aar aas aax af- afa aff afg afi afo afp afr afs afx ag- aga agf agg agi ago agp agr ags agx ai- aia aif aig aii aio aip air ais aix aoa aof aog aoi aoo aop aor aos aox ap- apa apf apg api apo app apr aps apx ar- ara arf arg ari aro arp arr ars arx as- asa asf asg asi aso asp asr ass asx ax- axa axi axo axp axr axs axx faa faf fag fai fao fap far fas fax ffa fff ffg ffi ffo ffp ffr ffs ffx fga fgf fgg fgi fgp fgr fgs fia fif fig fii fip fir fis fix foa fof fog foi foo fop for fos fox fpa fpg fpi fpo fpp fpr fps fpx fra frf frg fri fro frp frr frs fsa fsf fsg fsi fso fsp fsr fss fsx fxg fxi fxp fxr fxs fxx g-p gaa gaf gag gai gao gap gar gas gfa gff gfi gfo gfp gfr gfs gfx gga ggg ggi ggo ggp ggr ggs gia gif gig gii gio gip gir gis goa gof gog goi goo gop gor gos gox gpa gpf gpg gpi gpo gpp gpr gps gpx gra grf grg gri gro grp grr grs grx gsa gsf gsg gsi gso gsp gsr gss gsx gxa gxf gxp gxs i-f ia- iaa iaf iag iai iao iap iar ias ifa iff ifg ifi ifo ifp ifr ifs ifx iga igf igg igi igo igp igr igs iia iif iii iio iip iir iis iix io- ioa iof iog ioi ioo iop ior ios ipa ipf ipg ipi ipo ipp ipr ips ipx ir- ira irf irg iri iro irp irr irs irx is- isa isf isg isi iso isp isr iss ixi o-i oaa oaf oag oai oao oap oar oas oax of- ofa off ofg ofi ofo ofp ofr ofs ofx oga ogf ogg ogi ogo ogp ogs ogx oia oif oii oio oip oir ois oo- ooa oof oog ooi ooo oop oor oos oox op- opa opf opg opi opo opp opr ops opx or- ora orf org ori oro orp orr ors orx os- osa osf osg osi oso osp osr oss osx ox- oxa oxf oxi oxo oxx p-p paa paf pag pai pao pap par pas pax pfa pff pfg pfi pfo pfp pfr pfs pfx pga pgf pgg pgi pgo pgp pgr pgs pia pif pig pii pio pip pir pis pix poa pof pog poi poo pop por pos pox ppa ppf ppg ppi ppo ppp ppr pps ppx pra prf prg pri pro prp prr prs prx ps- psa psf psg psi pso psp psr pss psx pxg pxr pxs ra- raa raf rag rai rao rap rar ras rax rfa rff rfg rfi rfo rfp rfr rfs rga rgf rgg rgi rgo rgp rgr rgs rgx ria rif rig rii rio rip rir ris rix roa rof rog roi roo rop ror ros rox rpa rpf rpg rpi rpo rpp rpr rps rpx rra rrf rrg rri rrp rrr rrs rsa rsf rsg rsi rso rsp rsr rss rsx rxp rxr rxs saa saf sag sai sao sap sar sas sax sfa sff sfg sfi sfo sfp sfr sfs sfx sga sgf sgg sgi sgo sgp sgr sgs sgx sia sif sig sii sio sip sir sis six soa sof sog soi soo sop sor sos sox spa spf spg spi spo spp spr sps spx sr- sra srf srg sri sro srp srr srs srx ss- ssa ssf ssg ssi sso ssp ssr sss ssx sxi sxs xaa xaf xag xap xar xas xfa xfs xfx xgi xgp xia xii xio xis xix xoa xof xog xoi xoo xop xor xos xox xpa xpf xpg xpo xpp xps xrf xrx xsa xsi xsp xss xxi xxo xxp xxx