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From: Hartmut Henkel <hartmut_henkel@gmx.de>
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Subject: metafun and \input graph
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When I try to run some plain MetaPost foo.mp file, which includes an
\input graph command, through mptopdf, e. g. by the call `mptopdf
foo.mp' fails. Check with texexec --mptex foo.mp shows

! Redundant equation.
<to be read again>
                   ;
l.148 Ten_to0=1;
                 Ten_to1=10; Ten_to2=100; Ten_to3=1000; Ten_to4=10000;

These are redundant, since the lines appear first in mp-form.mp and then
are again loaded from graph.mp.

Is there a way to use mptopdf for conversion of plain/non-metafun
MetaPost files, e. g. a switch for mptopdf?

Greetings Hartmut