
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
In a rectangle, if one line segment already exists and divides the rectangle into two regions, what is the maximum number of regions a rectangle can be divided into when adding three more line segments, such that at least one of these line segments must be parallel to one of the rectangle's sides?

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