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Test a math problem: the mobile phone screen is unlocked, and there are nine squares. How many are there?
Android phone pattern unlock ***389 1 12 (for reference only)

There are also certain rules for unlocking the nine-grid pattern of mobile phones, specifically:

1. passes through at least four points.

2. You can't pass the same point repeatedly.

3. The point in the middle of the path cannot be skipped (for example, from 1 to 3, you must go through 2) unless the intermediate point has been used.