
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
Consider a large square divided into a grid of 81 smaller squares (9x9). A shaded region is formed in the following manner: starting from the middle of the leftmost square on the second row from the top and ending at the middle of the rightmost square of the fifth row. What is the ratio of the area of the shaded region to the area of the large square?

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