
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
Four students, A, B, C, and D, must visit Cunxiang Road, Haxi Station, and Harbin Street, with each student going to exactly one location and Haxi Station having at least one visitor. Find the total number of possible visiting plans.

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