
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 of products, there are 4 genuine items and 3 defective items. If 2 items are randomly selected, among the following four pairs of events:  
① Exactly one defective item and exactly two defective items;  
② At least one defective item and all are defective;  
③ At least one genuine item and at least one defective item;  
④ At least one defective item and all are genuine.  
The pairs of events that are mutually exclusive are (fill in the numbers).

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