Sometimes they can get a lower price of a stamp - that it will cost them less money if they give the Post Office the regular zip code - the five numbers - and the four - the plus four numbers.
有时他们可以获得较低的邮票价格 - 如果他们向邮局提供常规邮政编码 - 五个数字 - 和四个 - 加四数字，他们将花费更少的钱。
![C \subset \mathbb{F}_2^n](/Images/godic/202502/06/1d400d1a515d59e5dd0fa694a501a9793853.png")
be a binary linear code length ![n](/Images/godic/202502/06/7b8b965ad4bca0e41ab51de7b31363a13853.png")
. The