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

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