
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
The diagram below is a $9 \times 9$ grid divided by bold lines into 9 "mini-grids" each containing 3 by 3 cells. Some small cells are filled with the numbers 1 to 9. Xiao Qing filled the empty cells in the 4th column with a natural number from 1 to 9 such that each row, each column, and each "mini-grid" contains no repeated numbers. Then, Xiao Qing wrote the numbers in the 4th column from top to bottom to form a 9-digit number. Please write out this 9-digit number and briefly explain the reasoning.

Present the answer in LaTex format: \boxed{Your answer}
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