a-a a-i a-t aaa aaf aai aar aat aax af- afa aff afi afr aft afx ai- aia aif aii air ait aix ar- ara arf ari arr art arx at- ata atf ati atr att atx ax- axa axi axr axt axx faa faf fai far fat fax ffa fff ffi ffr fft ffx fia fif fii fir fit fix fra frf fri frr frt fta ftf fti ftr ftt ftx fxi fxr fxt fxx i-f ia- iaa iaf iai iar iat ifa iff ifi ifr ift ifx iia iif iii iir iit iix ir- ira irf iri irr irt irx ita itf iti itt itx ixi ra- raa raf rai rar rat rax rfa rff rfi rfr rft ria rif rii rir rit rix rra rrf rri rrr rrt rta rtf rti rtr rtt rtx rxr t-x taa taf tai tar tat tax tfa tff tfi tfr tft tfx tia tif tii tir tit tix tra trf tri trr trt trx tta ttf tti ttr ttt ttx txf txi txt xaa xaf xar xat xfa xft xfx xia xii xit xix xrf xrt xrx xtf xti xtr xtx xxi xxx