
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 to angles $A$, $B$, $C$ are $a$, $b$, $c$ respectively, and it is given that $b^{2}-a^{2}=c(b-c)$, $a=4$,

$(1)$ If $b= \frac {4 \sqrt {6}}{3}$, find $B$;

$(2)$ If the area of $\triangle ABC$ is $4 \sqrt {3}$, find the values of $b$ and $c$.

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