-ol fff ffl ffo ffs fft ffv flf fll flo fls flt fof fol foo fos fot fsf fsl fso fss fst fsv ftf ftl fto fts ftt ftv fvt lff lfl lfo lfs lft llf lll llo lls llt llv lof lol loo los lot lov lsf lsl lso lss lst lsv ltf ltl lto lts ltt ltv lvf lvl lvs lvt lvv of- off ofl ofo ofs oft ofv olf oll olo ols olt oo- oof ool ooo oos oot oov os- osf osl oso oss ost osv ot- otf otl oto ots ott otv ov- ovf ovl ovo ovs ovv sff sfl sfo sfs sft sfv slf sll slo sls slt slv sof sol soo sos sot sov ss- ssf ssl sso sss sst ssv stf stl sto sts stt stv svf svl svo svs svt svv tff tfl tfo tfs tft tlf tll tlo tls tlt tlv to- tof tol too tos tot tov tsf tsl tso tss tst tsv ttf ttl tto tts ttt ttv tvf tvl tvo tvs tvt vff vfl vfs vft vfv vl- vlf vll vlo vls vlt vlv vof vol voo vos vot vov vsf vsl vso vss vst vsv vtl vto vts vtt vtv vvo vvs vvt vvv