
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
Mr. Matheson has four cards, numbered 1, 2, 3, 4. He gives one card each to Ben, Wendy, Riley, and Sara. Ben is not given the number 1. Wendy's number is 1 greater than Riley's number. Which number could Sara not have been given?

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