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randomDisc(numPoints):= block([p: []],
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local(goodp, random_int),
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goodp(x, y):=block([r: sqrt(x^2+y^2)],
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r>=10 and r<=15
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),
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random_int():= block([m: 15], m - random(2*(m+1)-1)),
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while length(p)<numPoints do block (
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[x: random_int(), y : random_int()],
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if goodp(x, y) then (
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p: cons([x, y], p)
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)
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),
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p)$
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p: randomDisc(100)$
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plot2d(['discrete, p], ['style, 'points]);
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