
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
Ten tennis players arrived at a competition, including 4 from Russia. According to the rules, the players are randomly paired for the first round. Find the probability that all the Russian players will play exclusively with other Russian players in the first round.

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