
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 line $(1+λ)x+(λ-1)y+2+2λ=0(λ≠±1)$ intersects the ellipse $\frac{x^{2}}{16}+ \frac{y^{2}}{12}=1$ at points $A$ and $B$, and the right focus of the ellipse is point $F$, find the perimeter of $△ABF$.

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