
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
Among 6 people, 4 are to be selected to visit four cities: Beijing, Harbin, Guangzhou, and Chengdu respectively. Each city must be visited by one person, and each person only visits one city. However, among the 6 people, two specific individuals (Person A and Person B) will not visit Harbin. The total number of different selection plans is

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