-er eee eef eek eel eer ees eet ef- efe eff efi efl efr efs eft eie eif eii eik eil eir eis eit eke ekf eki ekl ekr eks ekt ele elf eli elk ell elr els elt ere erf eri erk erl err ers ert es- ese esf esi esk esl esr ess est ete etf eti etk etl etr ets ett fee fef fei fek fel fer fes fet ffe fff ffi ffk ffl ffr ffs fft fie fif fii fik fil fir fis fit fkf fki fkk fkl fkt fle flf fli fll flr fls flt fre frf fri frk frl frr frs frt fse fsf fsi fsk fsl fsr fss fst fte ftf fti ftk ftl ftr fts ftt i-f ie- iee ief iei iek iel ier ies iet ife iff ifi ifl ifr ifs ift iie iif iii iil iir iis iit ike ikf iki ikk ikl ikr iks ikt il- ile ilf ili ilk ill ilr ils ilt ir- ire irf iri irk irl irr irs irt is- ise isf isi isk isl isr iss ist ite itf iti itk itl its itt k-t ke- kee kef kei kek kel ker kes ket kff kfi kfs kie kif kii kik kil kir kis kit kke kki kkk kkl kkr kks kkt kl- klf kli klr kls klt krf kri krk krl krr krs krt kse ksf ksi ksk ksl ksr kss kst kte ktf ktk ktl ktr kts ktt lee lef lei lek lel ler les let lfe lff lfi lfk lfl lfr lfs lft lie lif lii lik lil lir lis lit lkl lkr lks lkt lle llf lli llk lll llr lls llt lrf lri lrk lrr lrs lrt lse lsf lsi lsk lsl lsr lss lst lte ltf lti ltk ltl ltr lts ltt re- ree ref rei rek rel rer res ret rfe rff rfi rfk rfl rfr rfs rft rie rif rii rik ril rir ris rit rke rkf rkk rks rkt rle rlf rli rll rlr rls rlt rrf rri rrk rrl rrr rrs rrt rse rsf rsi rsk rsl rsr rss rst rte rtf rti rtk rtl rtr rts rtt se- see sef sei sek sel ser ses set sfe sff sfi sfk sfl sfr sfs sft sie sif sii sik sil sir sis sit sk- ske skf ski skk skl skr sks skt sle slf sli slk sll slr sls slt sr- sre srf sri srk srl srr srs srt ss- sse ssf ssi ssk ssl ssr sss sst ste stf sti stk stl str sts stt te- tee tef tei tek tel ter tes tet tfe tff tfi tfk tfl tfr tfs tft tie tif tii tik til tir tis tit tke tkk tkl tkr tks tkt tle tlf tli tlk tll tlr tls tlt tre trf tri trk trl trr trs trt tse tsf tsi tsk tsl tsr tss tst tte ttf tti ttk ttl ttr tts ttt