United States Playing Card Company their standard 404 and the deluxe 606 which had gold edges. In modern use, the Congress brand is used for contract bridge cards and accessories. Congress cards come in an assortment of back designs. Each Congress deck consists of the 52 standard cards, two jokers, and an information card describing bridge scoring. Congress cards are now typically sold in coordinated sets of two decks to facilitate the common bridge practice of alternating decks between hands. Naipes Heraclio Fournier S.A. manufactures many different sets of playing cards, most for sale in Europe. Fournier cards are also common choices for casinos around
Zener cards the experimenter picks up a card in a shuffled pack, observes the symbol, and records the answer of the person being tested, who would guess which of the five designs is on the card. The experimenter continues until all the cards in the pack are tested. Poor shuffling methods can make the order of cards in the deck easier to predict and the cards could have been inadvertently or intentionally marked and manipulated. In his experiments, J. B. Rhine first shuffled the cards by hand but later decided to use a machine for shuffling. In his book, "The New Apocrypha",