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Since Arrow's Edge started developing and releasing online casino games in 2014 it has shown true dedication to high standards and innovation. 7. The Fibonacci system using the following number sequence to establish one's betting levels: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144 (etc.). If you are a 10-unit bettor, the sequence would go like this: 10 units, 10 units, 20 units, 30 units, 50 units,