
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
Begin with an equilateral triangle and extend its structure sequentially by constructing a square on one side of the triangle, followed by constructing a pentagon on one non-adjacent side of the square. Continue this pattern by constructing a hexagon adjacent to the pentagon and finally a heptagon adjacent to the hexagon. Calculate the total number of sides exposed to the outside in the resulting geometrical configuration.
A) 19
B) 21
C) 23
D) 25
E) 27

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