-ol fff ffl ffo ffp ffs fft flf fll flo flp fls flt fof fol foo fop fos fot fpl fpo fpp fps fpt fsf fsl fso fsp fss fst ftf ftl fto ftp fts ftt l-p lff lfl lfo lfp lfs lft llf lll llo llp lls llt lof lol loo lop los lot lpf lpl lpo lpp lps lpt lsf lsl lso lsp lss lst ltf ltl lto ltp lts ltt of- off ofl ofo ofp ofs oft olf oll olo olp ols olt oo- oof ool ooo oop oos oot op- opf opl opo opp ops opt os- osf osl oso osp oss ost ot- otf otl oto otp ots ott p-p pff pfl pfo pfp pfs pft plf pll plo plp pls plt pof pol poo pop pos pot ppf ppl ppo ppp pps ppt ps- psf psl pso psp pss pst pt- ptf ptl pto ptp pts ptt sff sfl sfo sfp sfs sft slf sll slo slp sls slt sof sol soo sop sos sot spf spl spo spp sps spt ss- ssf ssl sso ssp sss sst stf stl sto stp sts stt tff tfl tfo tfp tfs tft tlf tll tlo tlp tls tlt to- tof tol too top tos tot tpf tpl tpo tpp tps tpt tsf tsl tso tsp tss tst ttf ttl tto ttp tts ttt