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Preview sample (PDF)English Number Pattern Detective Level 11 for practicing read steadily growing differences. Includes 8 sequence clues in 2 case files, a detective guide, professional original detective artwork, and complete answer keys across 6 pages. Every sequence and anomaly has been verified against its exact rule. Recommended for ages 7+. Difficulty: Developing. Price: THB 3 (approximately US$0.09; charged in THB, 30 Jul 2026).