
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
On the sides \( AB \) and \( BC \) of an isosceles triangle \( ABC \), points \( M \) and \( N \) are marked such that \( AM = MN = NC \). On the side \( AC \), points \( P \) and \( Q \) are chosen such that \( MQ \parallel BC \) and \( NP \parallel AB \). It is known that \( PQ = BM \). Find the angle \( \angle MQB \).

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