-ol fff ffi ffl ffo ffs fft fif fii fil fis fit flf fli fll flo fls flt fof foi fol foo fos fot fsf fsi fsl fso fss fst ftf fti ftl fto fts ftt i-f iff ifi ifl ifo ifs ift iif iii iil iio iis iit il- ilf ili ill ilo ils ilt io- iof ioi iol ioo ios iot is- isf isi isl iso iss ist itf iti itl ito its itt lff lfi lfl lfo lfs lft lif lii lil lio lis lit llf lli lll llo lls llt lof loi lol loo los lot lsf lsi lsl lso lss lst ltf lti ltl lto lts ltt o-i of- off ofi ofl ofo ofs oft oif oii oil oio ois oit olf oli oll olo ols olt oo- oof ooi ool ooo oos oot os- osf osi osl oso oss ost ot- otf oti otl oto ots ott sff sfi sfl sfo sfs sft sif sii sil sio sis sit slf sli sll slo sls slt sof soi sol soo sos sot ss- ssf ssi ssl sso sss sst stf sti stl sto sts stt tff tfi tfl tfo tfs tft tif tii til tio tis tit tlf tli tll tlo tls tlt to- tof toi tol too tos tot tsf tsi tsl tso tss tst ttf tti ttl tto tts ttt