Chapter One Lit. Term, Motif

By reading the first chapter, I have spotted a motif in the text.  The phrase "So it goes" has been used many times by Vonnegut.  The phrase is often used to describe a death of one of the characters described by Vonnegut.  I expect this phrase to be used many times later on during the novel and will be looking to see if it is used only when the death of a character is mentioned.