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% I
input ../def;
beginchar(73, 9);
    x1 := 4.0 * ox;
    top y1 := 21.0 * oy;
    x2 := 4.0 * ox;
    bot y2 := 0.0 * oy;
    x3 := 5.0 * ox;
    top y3 := 21.0 * oy;
    x4 := 5.0 * ox;
    bot y4 := 0.0 * oy;

draw z1 -- z2; 
draw z3 -- z4;

serif(2,1,4,3,2);
serif(1,2,3,4,0);

endchar(4);
end;