
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
Line segment \(AD\) is divided into three segments by points \(B\) and \(C\), so that \(AB : BC = 1 : 2\) and \(BC : CD = 6 : 5\). The length of \(AD\) is 56 units. What is the length of \(AB\)?

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