There are two jokers. They are not distinguished from each other. Sets Certain groups of cards are known as legal sets . Any other group of cards is an illegal set . There are two types of legal sets, pure sets and jokered sets .
Legal sets fall into four categories, called spectra .
It is possible for a legal set to belong to more than one spectrum. The four spectra are Aces , Multiples , Couples , and Runs . The following descriptions of the spectra define what pure sets belong to each spectrum. The classification of jokered sets is explained in the section on jokered sets. Any number of As constitutes a pure set in the Aces spectrum.