user
What is the mistake in the the following list: ABCDEFGHIJKLMNOPQRSTUVWXYZ?
A: table of contents
B: word is repeated
C: cotton
D: goof
E: invitation
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

B

<|end_of_solution|>