
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
In a $3 \times 3$ grid filled with the numbers 1 to 9, the cell with the largest number in each row is colored red, and the cell with the smallest number in each row is colored green. Let $M$ be the smallest number among the three red cells, and $m$ be the largest number among the three green cells. Then, the number of different values that $M - m$ can have is ____.

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