-er eee eef een eeo eep eer eev ef- efe eff efo efp efr en- ene enf enn eno enp enr env eo- eoe eof eon eoo eop eor ep- epe epf epn epo epp epr ere erf ern ero erp err erv eve evf evn evo evp evr evv fee fef fen feo fep fer fev ffe fff ffn ffo ffp ffr ffv fne fnf fnn fnp fnr fnv foe fof fon foo fop for fpe fpn fpo fpp fpr fpv fre frf frn fro frp frr fvp ne- nee nef nen neo nep ner nev nfe nff nfn nfo nfp nfr nfv nne nnf nnn nno nnp nnv no- noe nof non noo nop nor nov npe npf npn npo npp npr npv nre nrf nrn nro nrp nrr nrv nve nvn nvp nvv oee oef oen oeo oep oer of- ofe off ofn ofo ofp ofr ofv on- one onf onn ono onp onr oo- oof oon ooo oop oor oov op- ope opf opn opo opp opr opv or- ore orf orn oro orp orr orv ov- ove ovf ovo ovp ovv p-p pee pef pen peo pep per pev pfe pff pfn pfo pfp pfr pfv pn- pne pnf pnn pno pnp pnr pnv poe pof pon poo pop por pov ppe ppf ppn ppo ppp ppr ppv pre prf prn pro prp prr prv pve pvf pvn pvo pvp pvr pvv re- ree ref ren reo rep rer rev rfe rff rfn rfo rfp rfr rfv rnn rno rnp rnr rnv roe rof ron roo rop ror rov rpe rpf rpn rpo rpp rpr rpv rrf rrn rrp rrr rve rvf rvn rvo rvp rvr rvv v-e vee vef ven veo vep ver vff vfn vfp vfr vfv vn- vnf vno vnp vnr vnv voe vof von voo vop vor vov vpe vpf vpn vpo vpp vpr vre vrf vrn vrp vrr vvo vvr vvv