
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
A large square with a side of 10 units is divided into 25 congruent smaller squares. Five of these smaller squares are shaded. Calculate the area of the shaded region.

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