Fill a large pot with lightly salted water and bring to a rolling boil over high heat. Once the water is boiling, stir in the rotini, and return to a boil. Cook uncovered, stirring occasionally, until the pasta has cooked through, but is still firm to the bite, about 8 minutes. Drain and cool by running cold water over the pasta in a colander set in the sink.
Combine cooked and cooled pasta with the cucumbers, onion, tomatoes, and olives in a large bowl. Pour the Italian dressing over the salad and stir to combine. Cover and refrigerate for at least two hours before serving.
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