
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 the sets $A={x|a\leqslant x\leqslant a+3}$ and $B={x|x < -1$ or $x > 5}$.
(I) If $a=-2$, find $A\cap \neg_{R}B$;
(II) If $A\cup B=B$, find the range of values for $a$.

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