fff ffi ffm ffo ffs fft fif fii fim fis fit fmf fmi fmm fmo fms fmt fof foi fom foo fos fot fsf fsi fsm fso fss fst ftf fti ftm fto fts ftt i-f iff ifi ifm ifo ifs ift iif iii iim iio iis iit im- imf imi imm imo ims imt io- iof ioi iom ioo ios iot is- isf isi ism iso iss ist itf iti itm ito its itt m-f m-o mff mfi mfm mfo mfs mft mi- mif mii mim mio mis mit mmf mmi mmm mmo mms mmt mof moi mom moo mos mot msf msi msm mso mss mst mtf mti mtm mto mts mtt o-i of- off ofi ofm ofo ofs oft oif oii oim oio ois oit om- omf omi omm omo oms omt oo- oof ooi oom ooo oos oot os- osf osi osm oso oss ost ot- otf oti otm oto ots ott sff sfi sfm sfo sfs sft sif sii sim sio sis sit smf smi smm smo sms smt sof soi som soo sos sot ss- ssf ssi ssm sso sss sst stf sti stm sto sts stt tff tfi tfm tfo tfs tft tif tii tim tio tis tit tmf tmi tmm tmo tms tmt to- tof toi tom too tos tot tsf tsi tsm tso tss tst ttf tti ttm tto tts ttt