
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
Three identical cones with vertex $A$ touch each other externally. Each of them touches internally a fourth cone with vertex at point $A$ and an apex angle of $\frac{2 \pi}{3}$. Find the apex angle of the identical cones. (The apex angle of a cone is the angle between its generatrices in the axial section.)

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