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% --- start of displayed preamble in the book ---
% --- end of displayed preamble in the book ---
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
u=2.5cm;
path p;
p= (0,0) {dir 130}..
{dir -130}(0.25u,0){dir 130}..
{dir -130}(0.5u,0){dir 130}..
{dir -130}(0.75u,0){dir 130}..
{dir -130}(u,0);
draw p rotated -90;
endfig;
end;
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