
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
Given six digits 0, 1, 2, 3, 4, and 5, form a four-digit number without repeating any digit. If a number is considered a "Descending Number" when each of its digits is less than the digit to its left, find the total number of "Descending Numbers" that can be formed from the above digits.

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