
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
There are 4 tourists visiting a certain place. If each person can only choose one of the three different scenic spots, A, B, and C, to visit, and each scenic spot is visited by at least one person, then there are a total of $\boxed{\text{blank}}$ different selection schemes.

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