search accents in pdf generated by TeX

[Gérald Tenenbaum]

Hello,

I come across  an unexpected issue with the pdf file of a book written 
with eplain. I turns out that accented letters are not recognized by the 
pdf. is there anything I can modify either in the source or in the pdf 
to make accents recognized?
Many thanks in advance for any help.
Gérald Tenenbaum
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