
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
The whole numbers from 1 through 81 are written, one per square, on a larger checkerboard (a 9 by 9 array of 81 squares). The first 9 numbers are written in order across the first row, the next 9 across the second row, and so on. After all 81 numbers are written, what is the sum of the numbers in the four corners of this checkerboard?
A) 164
B) 165
C) 166
D) 167
E) 168

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