Standard 52-card deck jokers, often distinguishable with one being more colorful than the other, are added to commercial decks, as some card games require these extra cards. Modern playing cards carry index labels on opposite corners or in all four corners to facilitate identifying the cards when they overlap and so that they appear identical for players on opposite sides. The most popular standard pattern of the French deck is sometimes referred to as "English" or "Anglo-American" pattern. It has been shown that because of the large number of possibilities from shuffling a 52-card deck, it is probable that no two fair card
Pack (compression) Pack (compression) Pack is a (now deprecated) Unix shell compression program based on Huffman coding. The unpack utility will restore files to their original state after they have been compressed using the "pack" utility. If no files are specified, the standard input will be uncompressed to the standard output. Although obsolete, support for packed files exists in modern compression tools such as gzip and 7-zip. Files compressed by "pack" are typically given the extension ".z" (not to be confused with the ".Z" of compress). Files can be returned to their original state using "unpack". In addition, there may also be