
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
To prevent Xiao Qiang from getting addicted to mobile games, Dad has set a password on his phone. The password is 4 digits long, and each digit is a number between 0 and 9. If the sum of the 4 digits used in the password is 20, what is the maximum number of attempts Xiao Qiang would need to open the phone?

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