It's because of a ,,quoted-printable'' encoding of his messages. It's
used to encode national 8-bit characters so that they can be safely
sent thru 7-bit systems. They are replaced by =XX, where XX stands
for a hexadecimal code of the character. It implies that '=' sign is
replaced by '=3D'. Also, when a line length exceeds 70-something
characters, it becomes broken with a '=' sign at the end.
Since Yarn is not too clever at ,,quoted-printables'', there's a
utility that does a conversion: SOUPLK,
ftp://parnas.mimuw.edu.pl/pub/users/keplicz/piotr/souplk.zip.
However, this won't help about those long lines...
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| . ) |/ / ------ Piotr Keplicz ------ \ \| ( . |
|__||_|\_\ http://rainbow.mimuw.edu.pl/~pkeplicz /_/|_||__|