
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 parallelogram \(ABCD\), the angle bisectors at the side \(AD\) divide side \(BC\) at points \(M\) and \(N\) such that \(BM : MN = 1 : 5\). Find \(BC\) if \(AB = 3\).

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