-er eee eef eeo eep eer eet ef- efe eff efi efo efp efr eft eie eif eii eio eip eir eit eo- eoe eof eoi eoo eop eor eot ep- epe epf epi epo epp epr ept ere erf eri ero erp err ert ete etf eti eto etp etr ett fee fef fei feo fep fer fet ffe fff ffi ffo ffp ffr fft fie fif fii fip fir fit foe fof foi foo fop for fot fpe fpi fpo fpp fpr fpt fre frf fri fro frp frr frt fte ftf fti fto ftp ftr ftt i-f ie- iee ief iei iep ier iet ife iff ifi ifo ifp ifr ift iie iif iii iio iip iir iit io- ioe iof ioi ioo iop ior iot ipe ipf ipi ipo ipp ipr ipt ir- ire irf iri iro irp irr irt ite itf iti ito itp itt o-i oee oef oei oeo oep oer oet of- ofe off ofi ofo ofp ofr oft oie oif oii oio oip oir oit oo- oof ooi ooo oop oor oot op- ope opf opi opo opp opr opt or- ore orf ori oro orp orr ort ot- ote otf oti oto otp otr ott p-p pee pef pei peo pep per pet pfe pff pfi pfo pfp pfr pft pie pif pii pio pip pir pit poe pof poi poo pop por pot ppe ppf ppi ppo ppp ppr ppt pre prf pri pro prp prr prt pt- pte ptf pti pto ptp ptr ptt re- ree ref rei reo rep rer ret rfe rff rfi rfo rfp rfr rft rie rif rii rio rip rir rit roe rof roi roo rop ror rot rpe rpf rpi rpo rpp rpr rpt rrf rri rrp rrr rrt rte rtf rti rto rtp rtr rtt te- tee tef tei teo tep ter tet tfe tff tfi tfo tfp tfr tft tie tif tii tio tip tir tit to- toe tof toi too top tor tot tpe tpf tpi tpo tpp tpr tpt tre trf tri tro trp trr trt tte ttf tti tto ttp ttr ttt