Once a heavily industrial area, the storied East End of London attracted large numbers of immigrants and became known for its poverty and dense population. Vividly described by Charles Dickens, the neighborhood was haunted by Jack the Ripper in 1888, decimated by World War II bombing, and hosted the 2012 Summer Olympics. Natives of the East End, called Cockneys, are known for their dialect. A traditional definition holds that to be a Cockney, one has to have been born within the sound of what? Discuss