-er eee eef eer ees eet eex ef- efe eff efi efr efs eft efx eie eif eii eir eis eit eiu eix ere erf eri err ers ert eru es- ese esf esi esr ess est esu esx ete etf eti etr ets ett etu etx eu- eue euf eui eur eus eut eux ex- exe exi exr exs ext exu exx fee fef fei fer fes fet feu fex ffe fff ffi ffr ffs fft ffu ffx fie fif fii fir fis fit fiu fix fre frf fri frr frs frt fru fse fsf fsi fsr fss fst fsu fsx fte ftf fti ftr fts ftt ftu ftx fue fuf fui fur fus fut fuu fux fxe fxi fxr fxs fxt fxu fxx i-f ie- iee ief iei ier ies iet iex ife iff ifi ifr ifs ift ifu ifx iie iif iii iir iis iit iiu iix ir- ire irf iri irr irs irt iru irx is- ise isf isi isr iss ist isu ite itf iti its itt itu itx iu- iue iui iur ius iut ixe ixi re- ree ref rei rer res ret reu rex rfe rff rfi rfr rfs rft rfu rie rif rii rir ris rit rix rrf rri rrr rrs rrt rru rse rsf rsi rsr rss rst rsu rsx rte rtf rti rtr rts rtt rtu rtx rue ruf rui rur rus rut ruu rux rxr rxs se- see sef sei ser ses set seu sex sfe sff sfi sfr sfs sft sfu sfx sie sif sii sir sis sit siu six sr- sre srf sri srr srs srt srx ss- sse ssf ssi ssr sss sst ssu ssx ste stf sti str sts stt stu stx sue suf sui sur sus sut suu sux sxi sxs sxt sxu t-x te- tee tef tei ter tes tet teu tex tfe tff tfi tfr tfs tft tfu tfx tie tif tii tir tis tit tiu tix tre trf tri trr trs trt tru trx tse tsf tsi tsr tss tst tsu tsx tte ttf tti ttr tts ttt ttu ttx tue tuf tui tur tus tut tuu tux txe txf txi txs txt txu uee uef uei uer ues uet ufe uff ufi ufr ufs uft ufu ufx uie uif uii uir uis uit uiu ur- ure urf uri urr urs urt uru urx use usf usi usr uss ust usu usx ute utf uti utr uts utt utu utx uue uur uus uut uuu uxf uxr uxt uxu xee xer xes xet xeu xex xfe xfs xft xfx xie xii xis xit xiu xix xrf xrt xrx xsi xss xst xtf xti xtr xts xtx xue xui xus xxi xxx