fff ffi ffl ffp ffr ffs fif fii fil fip fir fis flf fli fll flp flr fls fpi fpl fpp fpr fps frf fri frl frp frr frs fsf fsi fsl fsp fsr fss i-f iff ifi ifl ifp ifr ifs iif iii iil iip iir iis il- ilf ili ill ilp ilr ils ipf ipi ipl ipp ipr ips ir- irf iri irl irp irr irs is- isf isi isl isp isr iss l-p lff lfi lfl lfp lfr lfs lif lii lil lip lir lis llf lli lll llp llr lls lpf lpi lpl lpp lpr lps lrf lri lrp lrr lrs lsf lsi lsl lsp lsr lss p-p pff pfi pfl pfp pfr pfs pif pii pil pip pir pis plf pli pll plp plr pls ppf ppi ppl ppp ppr pps prf pri prl prp prr prs ps- psf psi psl psp psr pss rff rfi rfl rfp rfr rfs rif rii ril rip rir ris rlf rli rll rlp rlr rls rpf rpi rpl rpp rpr rps rrf rri rrl rrp rrr rrs rsf rsi rsl rsp rsr rss sff sfi sfl sfp sfr sfs sif sii sil sip sir sis slf sli sll slp slr sls spf spi spl spp spr sps sr- srf sri srl srp srr srs ss- ssf ssi ssl ssp ssr sss