
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
Given two sets A and B defined as $A = \{x | a \leq x \leq a + 3\}$ and $B = \{x | x < -1 \text{ or } x > 5\}$, respectively. If the union of A and B is equal to B, i.e., $A \cup B = B$, then find the range of values for the real number $a$.

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