
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 telephone number in the format $d_1d_2d_3d_4-d_5d_6d_7d_8$. Define this number as memorable if the suffix $d_5d_6d_7$ is exactly the same as either $d_1d_2d_3$ or $d_2d_3d_4$. Assuming each $d_i$ can be any of the ten decimal digits $0,1,2,\ldots,9$, how many different memorable telephone numbers are possible?
A) 199990
B) 200000
C) 200010
D) 210000

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