
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
The kite \( ABCD \) is symmetric with respect to diagonal \( AC \). The length of \( AC \) is 12 cm, the length of \( BC \) is 6 cm, and the internal angle at vertex \( B \) is a right angle. Points \( E \) and \( F \) are given on sides \( AB \) and \( AD \) respectively, such that triangle \( ECF \) is equilateral.

Determine the length of segment \( EF \).

(K. Pazourek)

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