Anaphora

"...all our differences- while they didn't exactly vanish- seemed not nearly as important  as all the other things: like the fact that we had grown up together at Halisham, the fact that we knew and remembered things no one else did."  Page 5

Ishiguro here uses anaphora to emphasize Kathy's point. His repetition of "the fact that" further proves her connection with Ruth. Although they had been friends throughout their childhood and young adulthood, this is not first what Kathy remembers. She simply feels a connection to her because of Halisham. This is ironic, since later on in the book  they sit and reminisce for hours about their times together.  Yet this is an example of how the terms between the former best friends weren't at all their best when they last saw each other. This connection with Ruth also brings out something in Kathy: a sense of superiority. She somehow feels that because they attended Halisham, they are somehow better than everyone else and more entitled to privileges.