
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 coefficient of $x^{55}$ in the expansion of
\[(x - 1)(x^2 - 2)(x^3 - 3) \dotsm (x^9 - 9)(x^{10} - 10)(x^{11} - 11).\]

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