fff ffi ffk ffl ffp ffs fif fii fik fil fip fis fkf fki fkk fkl fkp flf fli fll flp fls fpi fpk fpl fpp fps fsf fsi fsk fsl fsp fss i-f iff ifi ifl ifp ifs iif iii iil iip iis ikf iki ikk ikl iks il- ilf ili ilk ill ilp ils ipf ipi ipl ipp ips is- isf isi isk isl isp iss kff kfi kfs kif kii kik kil kip kis kki kkk kkl kkp kks kl- klf kli kls kpf kpi kpk kpl kpp kps ksf ksi ksk ksl ksp kss l-p lff lfi lfk lfl lfp lfs lif lii lik lil lip lis lkl lkp lks llf lli llk lll llp lls lpf lpi lpk lpl lpp lps lsf lsi lsk lsl lsp lss p-p pff pfi pfk pfl pfp pfs pif pii pik pil pip pis pkf pki pkl pkp pks plf pli plk pll plp pls ppf ppi ppk ppl ppp pps ps- psf psi psk psl psp pss sff sfi sfk sfl sfp sfs sif sii sik sil sip sis sk- skf ski skk skl skp sks slf sli slk sll slp sls spf spi spk spl spp sps ss- ssf ssi ssk ssl ssp sss