
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
Rectangular corners, each 7 units on a side, are removed from a 35 unit by 45 unit rectangular sheet of cardboard. After the corners are removed, the remaining edges are folded up to form an open box. Compute the surface area, in square units, of the interior of the box.
A) 1300 square units
B) 1379 square units
C) 1500 square units
D) 1580 square units

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