
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
A suitcase lock has 4 dials each with the digits $0, 1, 2, \ldots, 9$. How many different settings are possible if all four digits have to be different, and the sum of the digits must be 20 or less?

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