
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
A square grid consists of 169 uniformly spaced points, including those on the edges. If point $P$ is at the center of the square and another point $Q$ is randomly selected from the 168 other points, calculate the probability that line $PQ$ is a line of symmetry for the square.
**A)** $\frac{1}{7}$
**B)** $\frac{2}{7}$
**C)** $\frac{1}{6}$
**D)** $\frac{3}{13}$

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