
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
Given a point M(a, b) in the Cartesian coordinate system xOy, where a is chosen from the numbers 1, 2, 3, and b is chosen from the numbers 1, 2, 3, 4. Define the event "point M(a, b) lies on the line x+y=n" as event $Q_n$ ($2 \leq n \leq 7$, n is an integer). Then, when the probability of $Q_n$ is the highest, all possible values of n are.

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