
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
Find the distance from the point \( M_{0} \) to the plane that passes through the three points \( M_{1}, M_{2}, \) and \( M_{3} \).

\[ M_{1}(-2, -1, -1) \]
\[ M_{2}(0, 3, 2) \]
\[ M_{3}(3, 1, -4) \]
\[ M_{0}(-21, 20, -16) \]

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