
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
Proposition p: For a real number $x$, it satisfies $x^2 - 4ax + 3a^2 < 0$, where $a < 0$; Proposition q: For a real number $x$, it satisfies $x^2 - x - 6 \leq 0$ or $x^2 + 2x - 8 > 0$. If the negation of p is a necessary but not sufficient condition for the negation of q, find the range of values for $a$.

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