
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
From the numbers \(1, 2, 3, \cdots, 7\), calculate the number of ways to select several numbers such that the sum of the even numbers is equal to the sum of the odd numbers.

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