-er eee eef eek eeo eep eer ees eet ef- efe eff efi efo efp efr efs eft eie eif eii eik eio eip eir eis eit eke ekf eki eko ekp ekr eks ekt eo- eoe eof eoi eok eoo eop eor eos eot ep- epe epf epi epo epp epr eps ept ere erf eri erk ero erp err ers ert es- ese esf esi esk eso esp esr ess est ete etf eti etk eto etp etr ets ett fee fef fei fek feo fep fer fes fet ffe fff ffi ffk ffo ffp ffr ffs fft fie fif fii fik fip fir fis fit fkf fki fkk fkp fkt foe fof foi fok foo fop for fos fot fpe fpi fpk fpo fpp fpr fps fpt fre frf fri frk fro frp frr frs frt fse fsf fsi fsk fso fsp fsr fss fst fte ftf fti ftk fto ftp ftr fts ftt i-f ie- iee ief iei iek iep ier ies iet ife iff ifi ifo ifp ifr ifs ift iie iif iii iio iip iir iis iit ike ikf iki ikk iko ikr iks ikt io- ioe iof ioi ioo iop ior ios iot ipe ipf ipi ipo ipp ipr ips ipt ir- ire irf iri irk iro irp irr irs irt is- ise isf isi isk iso isp isr iss ist ite itf iti itk ito itp its itt k-t ke- kee kef kei kek keo kep ker kes ket kff kfi kfo kfs kie kif kii kik kio kip kir kis kit kke kki kkk kkp kkr kks kkt koe kof koi kok koo kop kor kos kot kpe kpf kpi kpk kpo kpp kpr kps kpt krf kri krk kro krp krr krs krt kse ksf ksi ksk kso ksp ksr kss kst kte ktf ktk kto ktp ktr kts ktt o-i oee oef oei oeo oep oer oes oet of- ofe off ofi ofo ofp ofr ofs oft oie oif oii oik oio oip oir ois oit oke oki okk oko okp okr oks oo- oof ooi ook ooo oop oor oos oot op- ope opf opi opk opo opp opr ops opt or- ore orf ori ork oro orp orr ors ort os- ose osf osi osk oso osp osr oss ost ot- ote otf oti otk oto otp otr ots ott p-p pee pef pei pek peo pep per pes pet pfe pff pfi pfk pfo pfp pfr pfs pft pie pif pii pik pio pip pir pis pit pke pkf pki pko pkp pkr pks pkt poe pof poi pok poo pop por pos pot ppe ppf ppi ppk ppo ppp ppr pps ppt pre prf pri prk pro prp prr prs prt ps- pse psf psi psk pso psp psr pss pst pt- pte ptf pti ptk pto ptp ptr pts ptt re- ree ref rei rek reo rep rer res ret rfe rff rfi rfk rfo rfp rfr rfs rft rie rif rii rik rio rip rir ris rit rke rkf rkk rko rkp rks rkt roe rof roi rok roo rop ror ros rot rpe rpf rpi rpk rpo rpp rpr rps rpt rrf rri rrk rrp rrr rrs rrt rse rsf rsi rsk rso rsp rsr rss rst rte rtf rti rtk rto rtp rtr rts rtt se- see sef sei sek seo sep ser ses set sfe sff sfi sfk sfo sfp sfr sfs sft sie sif sii sik sio sip sir sis sit sk- ske skf ski skk sko skp skr sks skt soe sof soi sok soo sop sor sos sot spe spf spi spk spo spp spr sps spt sr- sre srf sri srk sro srp srr srs srt ss- sse ssf ssi ssk sso ssp ssr sss sst ste stf sti stk sto stp str sts stt te- tee tef tei tek teo tep ter tes tet tfe tff tfi tfk tfo tfp tfr tfs tft tie tif tii tik tio tip tir tis tit tke tkk tko tkp tkr tks tkt to- toe tof toi tok too top tor tos tot tpe tpf tpi tpk tpo tpp tpr tps tpt tre trf tri trk tro trp trr trs trt tse tsf tsi tsk tso tsp tsr tss tst tte ttf tti ttk tto ttp ttr tts ttt