
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
There are five balls numbered 1, 2, 3, 4, 5, and five boxes also numbered 1, 2, 3, 4, 5. Now, these five balls are to be placed into these five boxes with the requirement that each box contains one ball, and exactly two balls' numbers match the numbers of the boxes they are placed in. How many such arrangements are there?

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