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Add cucumbers, tomatoes, olives, and onions to a bowl. Season with salt, pepper, and garlic powder.
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Once spaghetti is cooked, drain well and let cool for 5 minutes. While it cools, prepare your dressing.
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In a small bowl, mix together vinegar, dressing packet, and oil. Whisk well to combine.
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Toss cooled spaghetti with the vegetables and add the dressing. Toss well to coat.
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Refrigerate for at least four hours. Serve cold.