On Tue, Mar 25, 2014, Willy Offermans wrote:

> You are right. The following error occurs:
> Note: see README file in case of errors.
> pic -C op.me | eqn -C -Tascii | groff -Tascii -me | ul -t dumb > op.txt
> ul: unknown escape sequence in input: 33, 133

> I don't know what it means, if someone has an idea, please... 

How about reading the output of the command and following the advice?

Hmm, why are we putting those instructions there?
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