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diff --git a/Master/texmf-dist/doc/fonts/bartel-chess-fonts/other-sources/screengrid.mf b/Master/texmf-dist/doc/fonts/bartel-chess-fonts/other-sources/screengrid.mf
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+% This is
+% screengrid.mf
+%
+% Copyright (C) 1989-92 by Elmar Bartel.
+%
+% This program is free software; you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation; either version 1, or (at your option)
+% any later version.
+%
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this program; if not, write to the Free Software
+% Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+%
+
+
+vardef ScreenGrid(text xlist,ylist) =
+ xmin:= min(xlist); xmax:= max(xlist);
+ ymin:= min(ylist); ymax:= max(ylist);
+ for x=xlist: screenrule((x,ymin),(x,ymax)); endfor
+ for y=ylist: screenrule((xmin,y),(xmax,y)); endfor
+enddef;