
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
Randomly distribute four colored paper cards—red, black, white, and blue—to four individuals: A, B, C, and D, with each person receiving one card. The event "A receives the red card" and the event "B receives the red card" are (please fill in the correct number): 
① Mutually exclusive events 
② Impossible events 
③ Mutually exclusive but not complementary events.

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