fff ffi ffl ffr ffs fif fii fil fir fis flf fli fll flr fls frf fri frl frr frs fsf fsi fsl fsr fss i-f iff ifi ifl ifr ifs iif iii iil iir iis il- ilf ili ill ilr ils ir- irf iri irl irr irs is- isf isi isl isr iss lff lfi lfl lfr lfs lif lii lil lir lis llf lli lll llr lls lrf lri lrr lrs lsf lsi lsl lsr lss rff rfi rfl rfr rfs rif rii ril rir ris rlf rli rll rlr rls rrf rri rrl rrr rrs rsf rsi rsl rsr rss sff sfi sfl sfr sfs sif sii sil sir sis slf sli sll slr sls sr- srf sri srl srr srs ss- ssf ssi ssl ssr sss