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##
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uses Graphwpf;
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var count := 0;
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while count < 100 do
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begin
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var x := random(31) - 16;
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var y := random(31) - 16;
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var r := sqrt(x * x + y * y);
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if (r >= 10) and (r <= 15) then begin
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count += 1;
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fillcircle((x + 30) * 8, (y + 30) * 8, 3, colors.Black);
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end;
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end;
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