
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
In a box, there are 5 black balls and 4 white balls. A ball is randomly drawn each time. If a black ball is drawn, it is put back into the box, and another ball is drawn; if a white ball is drawn, the drawing stops. Determine the probability of stopping after the fourth draw.

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