
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
On a plane, using several unit-length sticks, you can form shapes made up of multiple adjacent squares, as shown in the example. Now, using 20 unit-length sticks, form a shape where, apart from the squares in the first row, the squares in the following rows form a rectangle. What is the maximum number of unit-length squares that such a shape can contain?

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