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Use the rule method to describe the following sets:
1. A = {violet, green, orange, yellow, blue, red, indigo}
2. P = {Earth, Neptune, Mercury, Saturn, Mars, Jupiter, Uranus, Venus}
3. X = {1, 3, 5, 7, 9, 11, 13}
4. Z = {5, 10, 15, 20, 25, 30, 35, 40, 45}