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Wash beans and remove ends and strings.
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In a medium saucepan cook green beans in a small amount of boiling water for 20 to 25 minutes or until crisp-tender.
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Meanwhile, for sauce, in a small saucepan stir together the yogurt and flour.
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Stir in horseradish, mustard and celery seed.
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Cook and stir till thickened and bubbly.
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Cook and stir for 1 minute more.
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Pour sauce over green beans; toss gently to coat.