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% --- start of displayed preamble in the book ---
input boxes
% --- end of displayed preamble in the book ---
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
boxjoin(a.e=b.w-(30,0));
boxit.one("One");
circleit.two("Two");
drawboxed(one,two);
label.lft("1.",one.w);
label.rt("2.",two.e);
label.top("a.",
point .5*length (one.c{dir 45}..two.c)
of (one.c{dir 45}..two.c) );
draw one.c{dir 45}..two.c
cutbefore bpath one
cutafter bpath two;
endfig;
end;
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