
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 four unmarked envelopes on a table, each containing a letter meant for a different person. If these envelopes are randomly distributed to these four people, with each person getting one envelope, what is the probability that no one receives their own letter?

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