Anaphora is the use of a referring to or replacing a word used earlier in a sentence, to avoid repetition, such as do in i like it and etc. So the passage from Kennedy's address that is an example of it is this one, "We shall not always expect to find them supporting our view. But we shall always hope to find them strongly supporting their own freedom--and to remember that, in the past, those who foolishly sought power by riding the back of the tiger ended up inside"