Hi all,

At the moment I try to get the slaughter-process for pigs into a flow chart.
This process involves 32 steps, wherein two procedures are included. At the
point, where the procedures are used, I need to use three columns.
Until tonoight I am able to have 15 steps correctly compiled. When I try to
add the step 16, which in fact is just one connection from bottom to top to
the next action-box Metapost gives again or still the already earlier
mentioned error:

This is MetaPost, Version 0.641 (Web2c 7.3)
......
>> unknown boolean xyfree0 17
! Not implemented: not(unknown boolean).
<to be read again>
                   and
points_initialized->...xyfree[(EXPR2)][(EXPR3)]and

.not.xyfree[(EXPR4)][(EXPR...

connect_top_bottom->...EXPR0),yfrom,(EXPR3),yto,6)

:xypoints[1]:=xy_top((EXPR...

connect_bottom_top->...))((EXPR0),(EXPR1),(EXPR2))
                                                  ;
l.321 connect_bottom_top(1,15,0) (0,0,0)
                                         ;
?

Might there be a buffer, which I must make bigger? -

For the ones who might be interested in the slaughter-proces of who want to
help me solve the problem I include the file in question: 'test.tex'.

Thanks for your assistance.