Input (grade 13): Rob Mariano, Rupert Boneham, Colby Donaldson and Jerri Manthey returned to Survivor once again in the show's 20th season, Survivor: Heroes vs. Villains.
Output (grade 8): Rob Mariano, Rupert Boneham, Jerri Manthey and Colby Donaldson returned in Survivor: Heroes vs. Villains, each on Survivor for a third time.