-er eee eef eek eeo eep eer eet ef- efe eff efi efo efp efr eft eie eif eii eik eio eip eir eit eke ekf eki eko ekp ekr ekt eo- eoe eof eoi eok eoo eop eor eot ep- epe epf epi epo epp epr ept ere erf eri erk ero erp err ert ete etf eti etk eto etp etr ett fee fef fei fek feo fep fer fet ffe fff ffi ffk ffo ffp ffr fft fie fif fii fik fip fir fit fkf fki fkk fkp fkt foe fof foi fok foo fop for fot fpe fpi fpk fpo fpp fpr fpt fre frf fri frk fro frp frr frt fte ftf fti ftk fto ftp ftr ftt i-f ie- iee ief iei iek iep ier iet ife iff ifi ifo ifp ifr ift iie iif iii iio iip iir iit ike ikf iki ikk iko ikr ikt io- ioe iof ioi ioo iop ior iot ipe ipf ipi ipo ipp ipr ipt ir- ire irf iri irk iro irp irr irt ite itf iti itk ito itp itt k-t ke- kee kef kei kek keo kep ker ket kff kfi kfo kie kif kii kik kio kip kir kit kke kki kkk kkp kkr kkt koe kof koi kok koo kop kor kot kpe kpf kpi kpk kpo kpp kpr kpt krf kri krk kro krp krr krt kte ktf ktk kto ktp ktr ktt o-i oee oef oei oeo oep oer oet of- ofe off ofi ofo ofp ofr oft oie oif oii oik oio oip oir oit oke oki okk oko okp okr oo- oof ooi ook ooo oop oor oot op- ope opf opi opk opo opp opr opt or- ore orf ori ork oro orp orr ort ot- ote otf oti otk oto otp otr ott p-p pee pef pei pek peo pep per pet pfe pff pfi pfk pfo pfp pfr pft pie pif pii pik pio pip pir pit pke pkf pki pko pkp pkr pkt poe pof poi pok poo pop por pot ppe ppf ppi ppk ppo ppp ppr ppt pre prf pri prk pro prp prr prt pt- pte ptf pti ptk pto ptp ptr ptt re- ree ref rei rek reo rep rer ret rfe rff rfi rfk rfo rfp rfr rft rie rif rii rik rio rip rir rit rke rkf rkk rko rkp rkt roe rof roi rok roo rop ror rot rpe rpf rpi rpk rpo rpp rpr rpt rrf rri rrk rrp rrr rrt rte rtf rti rtk rto rtp rtr rtt te- tee tef tei tek teo tep ter tet tfe tff tfi tfk tfo tfp tfr tft tie tif tii tik tio tip tir tit tke tkk tko tkp tkr tkt to- toe tof toi tok too top tor tot tpe tpf tpi tpk tpo tpp tpr tpt tre trf tri trk tro trp trr trt tte ttf tti ttk tto ttp ttr ttt