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% --- start of displayed preamble in the book ---
input metaobj
% Circles produced as before

% --- end of displayed preamble in the book ---

  newCircle.a(btex start etex);
  newCircle.b(btex end etex);
  a.c=origin;
  b.c-a.c=(3cm,1cm);

defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
drawObj(a,b);
ncline(a.c)(b.c);
endfig;
end;