
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
Kevin remembers that his four-digit gate code consists of the digits 5, 3, 9, and 1, but he can't recall the order. How many different combinations could there be for his gate code?

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