
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
Walking along the fence from north to south, the spacing between its posts is initially the same. From a certain post, the spacing decreases to 2.9 meters and remains that way until the southern end of the fence. Between the 1st and 16th posts (counting from the north), the spacing does not change and the distance between these two posts is 48 meters. The distance between the 16th and 28th posts is 36 meters.

At which post is the spacing between its neighboring posts different?

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