
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
All of Lauren's telephone numbers take the form $777-xab-yzbcw$, where $x$, $a$, $b$, $y$, $z$, $c$, $w$ are digits where $x, a, b, y, z, c, w$ are digits, and exactly one digit repeats exactly once out of those, but otherwise, they are distinct and in increasing order. Digits can range from $1$ to $9$ and no digit can be used more than twice. How many different telephone numbers can Lauren have?
**A)** 840  
**B)** 2520  
**C)** 5040  
**D)** 7560

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