(Pilot)
An open set is what most of this compendium falls into. An open set is a broader, open-ended group. It has information from more than one episode. An example of an open set is Big Starsky Smiles or Starsky and Hutch’s Physical Contact With Huggy.
A closed set is defined as a group of three or more things, seen or heard, from the same episode. It has no further additions. An example of a closed set is what Hutch tells Laura Kanen he would be a sushi chef, a go-cart mechanic or a ballerina if he stopped being a cop. (Deckwatch)