/// might be known as shared libraries, shared objects, dynamic shared
/// objects, or dynamic link libraries. Regardless of the terminology or the
/// operating system interface, this class provides a portable interface that
- /// allows dynamic libraries to be loaded and and searched for externally
+ /// allows dynamic libraries to be loaded and searched for externally
/// defined symbols. This is typically used to provide "plug-in" support.
/// It also allows for symbols to be defined which don't live in any library,
/// but rather the main program itself, useful on Windows where the main