【多选题】
A It can be created from a non-CDB.
B It can contain only one PDBSSEED, which is created when the CDB is created
C It can have local users with the same name in different PDBs.
D It can contain only one Application Container seed, which is created when the ApplicationContainer is created.
E It can be created by cloning an existing CDB.
F It can have any number of pluggable databases (PDBs) limited only by space availability
G It contains predefined common roles in both the root and the seed
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