Introduction - If you have any usage issues, please Google them yourself
A quick count of 24 licenses, in addition to the size of Wang addition to 52, from 1-13 for each number of each 4. Asked to design a procedure, for any given 52 licenses of four, the use of - × ÷ four computing to determine whether each number can only be used once, but you can not do not have to calculate 24 years.