
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
There is a  $2n\times 2n$  rectangular grid and a chair in each cell of the grid. Now, there are  $2n^2$  pairs of couple are going to take seats. Define the distance of a pair of couple to be the sum of column difference and row difference between them. For example, if a pair of couple seating at  $(3,3)$  and  $(2,5)$  respectively, then the distance between them is  $|3-2|+|3-5|=3$ . Moreover, define the total distance to be the sum of the distance in each pair. Find the maximal total distance among all possibilities.

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