
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
Each of the four cards has a natural number written on it. Two cards are randomly selected and the numbers on them are added. With equal probability, this sum can be less than 9, equal to 9, or greater than 9. What numbers can be written on the cards?

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