
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
Four friends, Masha, Nina, Lena, and Olya, all have different heights which are very close to each other, making it difficult to determine by sight. They decided to find out who is taller and who is shorter. It turned out that Nina is shorter than Masha, and Lena is taller than Olya. What is the probability that Nina is taller than Lena under these conditions?

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