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Base classes<br />
• Every type has at most one base type<br />
– System.Object and interfaces have no base type<br />
– System.Enum for enums, System.Array for arrays<br />
– Base type for classes defaults to System.Object if not explicitly<br />
specified<br />
– sealed class modifier prevents use as a base type<br />
– abstract class modifier mandates derivation<br />
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