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This reference can hold any instantiation of <code>Generic</code> with an actual type parameter of <code>SubtypeOfUpperBound</code>'s subtype. A wildcard that does not have an upper bound is effectively the same as one that has the constraint <code>extends Object</code>, since all types implicitly extend Object. A wildcard with a lower bound
<code>Generic<? '''super'''
can hold instantiations of <code>Generic</code> with any type that is both a subtype of <code>UpperBound</code> and a supertype of <code>SubtypeOfUpperBound</code>. The type bounds are trivial examples that conform.
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