
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 universal set $U=R$, $A={x|1\leqslant x\leqslant 3}$, $B={x|2a < x < a+3}$.
(I) When $a=1$, find $(C_{U}A)\cap B$;
(II) If $(C_{U}A)\cap B=B$, find the range of values for the real number $a$.

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