
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 sets $A=\{x|a\leqslant x \lt 7\}(a\in R)$ and $B=\{x|2 \lt x \lt 10\}$.  
$(Ⅰ)$ If $a=3$, find $A$⋃$B$ and $B$⋂$(\complement _{R}A)$;  
$(Ⅱ)$ If $A\subseteq B$, find the range of $a$.

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