
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
Eight students from a university are planning to carpool for a trip, with two students from each of the grades one, two, three, and four. The students are divided into two cars, A and B, each seating four students. Given that the twin sisters from the first grade must ride in the same car, calculate the number of ways to arrange the four students in car A such that exactly two of them are from the same grade.

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