
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
In triangle $ABC$, the sides opposite angles $A$, $B$, and $C$ are $a$, $b$, and $c$ respectively, and it is given that $(2a - \sqrt{3}c)^2 = 4b^2 - c^2$.  
$(I)$ Find the size of angle $B$;  
$(II)$ If $b=1$, find the range of values for $\sqrt{3}a - c$.

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