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You're perfectly right, so here's my new sequence :
1) read utf8-encoded file where all the towns are
2) get the utf8-encoded stream and remove all the accents
3) search whether the utf8-string is...

Here's what I want to do :
1) decode utf8 stream to latin-1
2) remove all the accents
3) look for a town in a file
4) once the town is found (if it's found), the town is latin-1 encoded : encode...