This document contains lyrics from the song "Hot N Cold" by Katy Perry with blanks that need to be filled in. The song is about a relationship with someone who is "hot then cold" and changes their moods frequently, like being "yes then no" and "in then out." The singer describes how they used to get along well but now the person is "plain boring." Someone needs to "call the doctor" because they have a "case of love bipolar" and are "stuck on a roller coaster" of changing emotions.