-er eee eef een eep eer ef- efe eff efi efp efr eie eif eii ein eip eir en- ene enf eni enn enp enr ep- epe epf epi epn epp epr ere erf eri ern erp err fee fef fei fen fep fer ffe fff ffi ffn ffp ffr fie fif fii fin fip fir fne fnf fni fnn fnp fnr fpe fpi fpn fpp fpr fre frf fri frn frp frr i-f ie- iee ief iei ien iep ier ife iff ifi ifn ifp ifr iie iif iii iin iip iir in- ine inf ini inn inp inr ipe ipf ipi ipn ipp ipr ir- ire irf iri irn irp irr n-i ne- nee nef nei nen nep ner nfe nff nfi nfn nfp nfr nie nif nii nin nip nir nne nnf nni nnn nnp npe npf npi npn npp npr nre nrf nri nrn nrp nrr p-p pee pef pei pen pep per pfe pff pfi pfn pfp pfr pie pif pii pin pip pir pn- pne pnf pni pnn pnp pnr ppe ppf ppi ppn ppp ppr pre prf pri prn prp prr re- ree ref rei ren rep rer rfe rff rfi rfn rfp rfr rie rif rii rin rip rir rni rnn rnp rnr rpe rpf rpi rpn rpp rpr rrf rri rrn rrp rrr