
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 memorable 8-digit telephone number is defined as $d_1d_2d_3d_4d_5d_6d_7d_8$ where the sequence $d_1d_2d_3d_4$ is exactly the same as the sequence $d_5d_6d_7d_8$. Assuming that each \(d_i\) can be any decimal digit from 0 to 9, calculate the number of different memorable telephone numbers.
A) 9050
B) 9500
C) 9900
D) 10000

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