
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
Let $ABCDE$ be a pentagon inscribed in a circle such that $AB = CD = 4$, $BC = DE = 7$, and $AE= 13$. Additionally, the length of diagonal $AC$ is known to be $9$. Calculate the sum of the lengths of diagonals $BD$ and $CE$.

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