This is the 3256th most frequent Russian word.
одни
"Одни" means "some" or "alone" depending on the context.
In this sentence, 'одни' is used as a pronoun to refer to some individuals in contrast with others.
Одни студенты пришли на лекцию, а другие остались дома.
Some students came to the lecture, while others stayed at home.
Here, 'одни' is part of the expression 'одни и те же', meaning 'the same' and emphasizing repetition.
Он одни и те же книги читает каждый год.
He reads the same books every year.
Similarly, in this sentence, 'одни и те же' highlights the repeating or usual nature of the items mentioned.