
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
Let's define a $8$-digit telephone number $d_1d_2d_3-d_4d_5d_6d_7d_8$ as memorable if the prefix $d_1d_2d_3$ is exactly the same as the sequence $d_4d_5d_6$ or the sequence $d_6d_7d_8$, or both. Each digit $d_i$ can be any decimal digit from $0$ to $9$. Determine the number of different memorable telephone numbers.
A) 199980
B) 199990
C) 200000
D) 200010
E) 200020

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