
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
There are five people, \( \mathbf{A} \), \( \mathbf{B} \), \( \mathbf{C} \), \( \mathbf{D} \), and \( \mathbf{E} \), each of whom either always tells the truth or always lies, and they all know each other's behavior. \( \mathrm{A} \) says that \( \mathrm{B} \) is a liar, \( \mathrm{B} \) says that \( \mathrm{C} \) is a liar, \( \mathrm{C} \) says that \( \mathrm{D} \) is a liar, and \( \mathrm{D} \) says that \( \mathbf{E} \) is a liar. How many liars can there be at most among these five people?

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