
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]


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In ancient China, a day and night were divided into twelve time periods, each called a "shi chen." The correspondence between ancient and modern times (partially) is shown in the table below. Xiao Ming and three other students from the astronomy interest group will be conducting relay observations from tonight at 23:00 to tomorrow morning at 7:00. Each person will observe for two hours, and the order of observation is randomly determined by drawing lots. The probability of Xiao Ming observing during the "zi shi" period is ______.

| Ancient Time | Zi Shi | Chou Shi | Yin Shi | Mao Shi |
|--------------|--------|----------|--------|--------|
| Modern Time  | 23:00~1:00 | 1:00~3:00 | 3:00~5:00 | 5:00~7:00 |

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