Please answer the following question: Information:  - "Superman (It's Not Easy)" is a song by American artist Five for Fighting. It was released in April 2001 as the second single from his album "America Town". The song debuted on the "Billboard" Hot 100 chart at number 38 on October 27, 2001. It peaked at number 14 on the chart. The song was nominated for a Grammy Award for Best Pop Performance by a Duo or Group with Vocals at the 44th Grammy Awards in 2002.  - Vladimir John Ondrasik III (born January 7, 1965), known by his stage name Five for Fighting, is an American singer, songwriter and record producer. He is best known for his piano-based rock, such as the top 40 hits, "Superman (It's Not Easy)" (2001), "100 Years" (2003) and "The Riddle" (2006).  - "100 Years" is a song by American artist Five for Fighting. It was released in November 2003 as the first single from the album "The Battle for Everything".  - `` World '' is a song written and recorded by American recording artist Five for Fighting . It was released in November 2006 as the second single from the album Two Lights . It reached number 14 on the U.S. Billboard Adult Pop Songs chart .    What is the relationship between 'world ' and 'the riddle'?
A:
follows