
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 that $P_1$ and $P_2$ are points on lines $l_1: x+3y-9=0$ and $l_2: x+3y+1=0$ respectively, find the minimum value of $|P_1P_2|$.

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