eee eef eeo ees eet ef- efe eff efi efo efs eft eie eif eii eio eis eit eo- eoe eof eoi eoo eos eot es- ese esf esi eso ess est ete etf eti eto ets ett fee fef fei feo fes fet ffe fff ffi ffo ffs fft fie fif fii fis fit foe fof foi foo fos fot fse fsf fsi fso fss fst fte ftf fti fto fts ftt i-f ie- iee ief iei ies iet ife iff ifi ifo ifs ift iie iif iii iio iis iit io- ioe iof ioi ioo ios iot is- ise isf isi iso iss ist ite itf iti ito its itt o-i oee oef oei oeo oes oet of- ofe off ofi ofo ofs oft oie oif oii oio ois oit oo- oof ooi ooo oos oot os- ose osf osi oso oss ost ot- ote otf oti oto ots ott se- see sef sei seo ses set sfe sff sfi sfo sfs sft sie sif sii sio sis sit soe sof soi soo sos sot ss- sse ssf ssi sso sss sst ste stf sti sto sts stt te- tee tef tei teo tes tet tfe tff tfi tfo tfs tft tie tif tii tio tis tit to- toe tof toi too tos tot tse tsf tsi tso tss tst tte ttf tti tto tts ttt