Question: Skagboys is a 2012 novel by Scottish writer Irvine Welsh, it is a prequel to his 2002 sequel, which novel published in 2002 by Scottish writer Irvine Welsh, and is the sequel to "Trainspotting"?

Related documents: [0]  [DOC] Porno is a novel published in 2002 by Scottish writer Irvine Welsh, and is the sequel to "Trainspotting". [END] 
[1]  [DOC] Skagboys is a 2012 novel by Scottish writer Irvine Welsh. It is a prequel to his 1993 novel "Trainspotting", and its 2002 sequel "Porno". It follows the earlier lives of characters Renton and Sick Boy as they first descend into heroin addiction. [END]  
Answer: Porno
Porno