
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
To understand the satisfaction level of the society with the quality of education provided by a school, the school decided to use stratified sampling to select 6 parents from the parent committees of three grades in high school for a questionnaire survey. It is known that there are 54, 18, and 36 parents in the parent committees of the first, second, and third grades of high school, respectively.  
(I) Calculate the number of parents that should be sampled from each grade level's parent committee;  
(II) If 2 out of the 6 sampled parents are randomly selected for a comparative analysis of the survey results, calculate the probability that at least one of the two is a parent of a third-grade student.

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