The check digit is used to confirm the initial digits of the card number. The benefits of using a checksum is that it prevents casual attempts to invent credit card numbers, as only one in ten will be valid.
Length (adj). the longest, or longer, dimension of any object, in distinction from breadth or width; extent of anything from end to end; the longest line which can be drawn through a body, parallel to its sides; as, the length of a church, or of a ship; the length of a rope or line.
Lee Redmond. Where. Spain Madrid. The longest fingernails belonged to Lee Redmond (USA), who started to grow them in 1979 and carefully manicured them to reach a total length of 8.65 m (28 ft 4.5 in) as measured on the set of Lo show dei record in Madrid, Spain, on 23 February 2008. Lee lost her nails in an automobile accident in early 2009.