-er eee eef eel een eer ef- efe eff efl efr ele elf ell eln elr en- ene enf enl enn enr ere erf erl ern err fee fef fel fen fer ffe fff ffl ffn ffr fle flf fll fln flr fne fnf fnl fnn fnr fre frf frl frn frr lee lef lel len ler lfe lff lfl lfn lfr lle llf lll lln llr lne lnl lnn lnr lrf lrn lrr ne- nee nef nel nen ner nfe nff nfl nfn nfr nle nlf nll nln nlr nne nnf nnl nnn nre nrf nrl nrn nrr re- ree ref rel ren rer rfe rff rfl rfn rfr rle rlf rll rln rlr rnn rnr rrf rrl rrn rrr