% --- start of displayed preamble in the book ---
input metauml
% --- end of displayed preamble in the book ---
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
Begin.b;
End.e;
b.nw=(0,0);
e.nw=(20,20);
drawObjects(b,e);
endfig;
end;