fff ffi ffm ffr fft ffx fif fii fim fir fit fix fmf fmi fmm fmr fmt fmx frf fri frm frr frt ftf fti ftm ftr ftt ftx fxi fxm fxr fxt fxx i-f iff ifi ifm ifr ift ifx iif iii iim iir iit iix im- imf imi imm imt imx ir- irf iri irm irr irt irx itf iti itm itt itx ixi m-f m-r mff mfi mfm mfr mft mi- mif mii mim mir mit mix mmf mmi mmm mmr mmt mmx mrf mri mrm mrr mrt mrx mtf mti mtm mtr mtt mtx mxi mxr rff rfi rfm rfr rft rif rii rim rir rit rix rmf rmi rmm rmr rmt rmx rrf rri rrm rrr rrt rtf rti rtm rtr rtt rtx rxr t-x tff tfi tfm tfr tft tfx tif tii tim tir tit tix tmf tmi tmm tmr tmt tmx trf tri trm trr trt trx ttf tti ttm ttr ttt ttx txf txi txt xfm xft xfx xii xit xix xmf xmi xmm xmr xmt xmx xrf xrt xrx xtf xti xtm xtr xtx xxi xxx