a-a a-i a-t aaa aaf aai aao aar aas aat aax af- afa aff afi afo afr afs aft afx ai- aia aif aii aio air ais ait aix aoa aof aoi aoo aor aos aot aox ar- ara arf ari aro arr ars art arx as- asa asf asi aso asr ass ast asx at- ata atf ati ato atr ats att atx ax- axa axi axo axr axs axt axx faa faf fai fao far fas fat fax ffa fff ffi ffo ffr ffs fft ffx fia fif fii fir fis fit fix foa fof foi foo for fos fot fox fra frf fri fro frr frs frt fsa fsf fsi fso fsr fss fst fsx fta ftf fti fto ftr fts ftt ftx fxi fxr fxs fxt fxx i-f ia- iaa iaf iai iao iar ias iat ifa iff ifi ifo ifr ifs ift ifx iia iif iii iio iir iis iit iix io- ioa iof ioi ioo ior ios iot ir- ira irf iri iro irr irs irt irx is- isa isf isi iso isr iss ist ita itf iti ito its itt itx ixi o-i oaa oaf oai oao oar oas oat oax of- ofa off ofi ofo ofr ofs oft ofx oia oif oii oio oir ois oit oo- ooa oof ooi ooo oor oos oot oox or- ora orf ori oro orr ors ort orx os- osa osf osi oso osr oss ost osx ot- ota otf oti oto otr ots ott ox- oxa oxf oxi oxo oxt oxx ra- raa raf rai rao rar ras rat rax rfa rff rfi rfo rfr rfs rft ria rif rii rio rir ris rit rix roa rof roi roo ror ros rot rox rra rrf rri rrr rrs rrt rsa rsf rsi rso rsr rss rst rsx rta rtf rti rto rtr rts rtt rtx rxr rxs saa saf sai sao sar sas sat sax sfa sff sfi sfo sfr sfs sft sfx sia sif sii sio sir sis sit six soa sof soi soo sor sos sot sox sr- sra srf sri sro srr srs srt srx ss- ssa ssf ssi sso ssr sss sst ssx sta stf sti sto str sts stt stx sxi sxs sxt t-x taa taf tai tao tar tas tat tax tfa tff tfi tfo tfr tfs tft tfx tia tif tii tio tir tis tit tix to- toa tof toi too tor tos tot tox tra trf tri tro trr trs trt trx tsa tsf tsi tso tsr tss tst tsx tta ttf tti tto ttr tts ttt ttx txf txi txs txt xaa xaf xar xas xat xfa xfs xft xfx xia xii xio xis xit xix xoa xof xoi xoo xor xos xot xox xrf xrt xrx xsa xsi xss xst xtf xti xtr xts xtx xxi xxo xxx