-er eee eef eel eer ees eet eex ef- efe eff efi efl efr efs eft efx eie eif eii eil eir eis eit eiu eix ele elf eli ell elr els elt elu elx ere erf eri erl err ers ert eru es- ese esf esi esl esr ess est esu esx ete etf eti etl etr ets ett etu etx eu- eue euf eui eul eur eus eut eux ex- exe exi exl exr exs ext exu exx fee fef fei fel fer fes fet feu fex ffe fff ffi ffl ffr ffs fft ffu ffx fie fif fii fil fir fis fit fiu fix fle flf fli fll flr fls flt flu flx fre frf fri frl frr frs frt fru fse fsf fsi fsl fsr fss fst fsu fsx fte ftf fti ftl ftr fts ftt ftu ftx fue fuf fui ful fur fus fut fuu fux fxe fxi fxr fxs fxt fxu fxx i-f ie- iee ief iei iel ier ies iet iex ife iff ifi ifl ifr ifs ift ifu ifx iie iif iii iil iir iis iit iiu iix il- ile ilf ili ill ilr ils ilt ilu ilx ir- ire irf iri irl irr irs irt iru irx is- ise isf isi isl isr iss ist isu ite itf iti itl its itt itu itx iu- iue iui iur ius iut ixe ixi ixl lee lef lei lel ler les let leu lex lfe lff lfi lfl lfr lfs lft lfu lfx lie lif lii lil lir lis lit liu lix lle llf lli lll llr lls llt llu lrf lri lrr lrs lrt lru lse lsf lsi lsl lsr lss lst lsu lte ltf lti ltl ltr lts ltt ltu ltx lue luf lui lul lur lus lut luu lux lxi lxr lxx re- ree ref rei rel rer res ret reu rex rfe rff rfi rfl rfr rfs rft rfu rie rif rii ril rir ris rit rix rle rlf rli rll rlr rls rlt rlu rrf rri rrl rrr rrs rrt rru rse rsf rsi rsl rsr rss rst rsu rsx rte rtf rti rtl rtr rts rtt rtu rtx rue ruf rui rur rus rut ruu rux rxr rxs se- see sef sei sel ser ses set seu sex sfe sff sfi sfl sfr sfs sft sfu sfx sie sif sii sil sir sis sit siu six sle slf sli sll slr sls slt slu slx sr- sre srf sri srl srr srs srt srx ss- sse ssf ssi ssl ssr sss sst ssu ssx ste stf sti stl str sts stt stu stx sue suf sui sul sur sus sut suu sux sxi sxl sxs sxt sxu t-x te- tee tef tei tel ter tes tet teu tex tfe tff tfi tfl tfr tfs tft tfu tfx tie tif tii til tir tis tit tiu tix tle tlf tli tll tlr tls tlt tlu tlx tre trf tri trl trr trs trt tru trx tse tsf tsi tsl tsr tss tst tsu tsx tte ttf tti ttl ttr tts ttt ttu ttx tue tuf tui tul tur tus tut tuu tux txe txf txi txl txs txt txu uee uef uei uel uer ues uet ufe uff ufi ufl ufr ufs uft ufu ufx uie uif uii uil uir uis uit uiu ule ulf uli ull ulr uls ult ulu ur- ure urf uri url urr urs urt uru urx use usf usi usl usr uss ust usu usx ute utf uti utl utr uts utt utu utx uue uur uus uut uuu uxf uxr uxt uxu xee xel xer xes xet xeu xex xfe xfl xfs xft xfx xie xii xis xit xiu xix xlf xli xlr xls xlt xrf xrt xrx xsi xsl xss xst xtf xti xtr xts xtx xue xui xul xus xxi xxl xxx