
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
Consider an 8-digit phone number $d_1d_2d_3d_4-d_5d_6d_7d_8$ to be fascinating if the sequence $d_1d_2d_3d_4$ matches either $d_2d_3d_4d_5$ or $d_5d_6d_7d_8$ (or both). Assuming each digit $d_i$ can be any decimal digit from 0 to 9, find the number of different fascinating phone numbers.
A) 8000
B) 9000
C) 10000
D) 11000
E) 12000

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