eee eef eeo eep ees eet ef- efe eff efi efo efp efs eft eie eif eii eio eip eis eit eo- eoe eof eoi eoo eop eos eot ep- epe epf epi epo epp eps ept es- ese esf esi eso esp ess est ete etf eti eto etp ets ett fee fef fei feo fep fes fet ffe fff ffi ffo ffp ffs fft fie fif fii fip fis fit foe fof foi foo fop fos fot fpe fpi fpo fpp fps fpt fse fsf fsi fso fsp fss fst fte ftf fti fto ftp fts ftt i-f ie- iee ief iei iep ies iet ife iff ifi ifo ifp ifs ift iie iif iii iio iip iis iit io- ioe iof ioi ioo iop ios iot ipe ipf ipi ipo ipp ips ipt is- ise isf isi iso isp iss ist ite itf iti ito itp its itt o-i oee oef oei oeo oep oes oet of- ofe off ofi ofo ofp ofs oft oie oif oii oio oip ois oit oo- oof ooi ooo oop oos oot op- ope opf opi opo opp ops opt os- ose osf osi oso osp oss ost ot- ote otf oti oto otp ots ott p-p pee pef pei peo pep pes pet pfe pff pfi pfo pfp pfs pft pie pif pii pio pip pis pit poe pof poi poo pop pos pot ppe ppf ppi ppo ppp pps ppt ps- pse psf psi pso psp pss pst pt- pte ptf pti pto ptp pts ptt se- see sef sei seo sep ses set sfe sff sfi sfo sfp sfs sft sie sif sii sio sip sis sit soe sof soi soo sop sos sot spe spf spi spo spp sps spt ss- sse ssf ssi sso ssp sss sst ste stf sti sto stp sts stt te- tee tef tei teo tep tes tet tfe tff tfi tfo tfp tfs tft tie tif tii tio tip tis tit to- toe tof toi too top tos tot tpe tpf tpi tpo tpp tps tpt tse tsf tsi tso tsp tss tst tte ttf tti tto ttp tts ttt