When using 3rd party libraries, not all of them prefix the units they use, so I tend to use this unix prefix list:
System;Xml;Data;Datasnap;Web;Soap;Winapi;System.Win;Xml.Win;Web.Win;Soap.Win;Data.Win;Datasnap.Win;Vcl;Vcl.Imaging;Vcl.Touch;Vcl.Samples;Vcl.Shell;
Note that it leaves out ;Bde; as that is a thing from a distant past.
–jeroen