
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
All numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 are filled into a 3 × 3 grid so that consecutive numbers occupy squares that share an edge. This time, the numbers in the four corners have a sum of 20, find the possible number in the center.

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