-ol fff ffl ffn ffo ffs fft flf fll fln flo fls flt fnf fnl fnn fns fnt fof fol fon foo fos fot fsf fsl fsn fso fss fst ftf ftl ftn fto fts ftt lff lfl lfn lfo lfs lft llf lll lln llo lls llt lnl lnn lno lns lnt lof lol lon loo los lot lsf lsl lsn lso lss lst ltf ltl lto lts ltt nff nfl nfn nfo nfs nft nlf nll nln nlo nls nlt nnf nnl nnn nno nns nnt no- nof nol non noo nos not nsf nsl nsn nso nss nst ntf ntn nto nts ntt of- off ofl ofn ofo ofs oft olf oll oln olo ols olt on- onf onl onn ono ons ont oo- oof ool oon ooo oos oot os- osf osl osn oso oss ost ot- otf otl otn oto ots ott sff sfl sfn sfo sfs sft slf sll sln slo sls slt snf snl snn sno sns snt sof sol son soo sos sot ss- ssf ssl ssn sso sss sst stf stl stn sto sts stt tff tfl tfn tfo tfs tft tlf tll tln tlo tls tlt tnf tnl tnn tno tns tnt to- tof tol ton too tos tot tsf tsl tsn tso tss tst ttf ttl ttn tto tts ttt