
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
Using "学" and "习" to represent two different digits, the product of the four-digit numbers "学学学学" and "习习习习" is a seven-digit number, and its units and millions digits are the same as the digit represented by "学". How many possible two-digit numbers can "学习" represent?

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