
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
Let $U = \mathbb{R}$, and let $A = \{x \mid a \leq x \leq b\}$. If the complement of $A$ with respect to $U$ is $C_UA = \{x \mid x > 4 \text{ or } x < 3\}$, find the values of $a$ and $b$.

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