Contiguous simply means touching or sharing a border, according to Merriam-Webster. When it comes to the United States, contiguous refers to all of the states that touch one another, without another country or a body of water coming between them. These are sometimes also referred to as the lower 48 states.
.apk extension stands for android package file. It is a file format used to distribute and install applications.It includes the programm codes ,assets ,resourses ,certificates and manifest file. .Dex extensions stands for Dalvix Executable files.
APO stands for Army Post Office. The AE stands for Army Europe and the number are just a place state side that the mail will be shipped from to get to the location overseas. It does it this way so it does not cost as much to ship things then it would with regular overseas mail.