The output is YY, with no newline. The variable a has static type A, although its runtime type is B. Both c.m(a) and d.m(a) therefore select the signature m(A) at compile time. The m(B) alternative is not applicable to an argument whose static type is merely A.
Both receivers refer to the same D object. Dynamic dispatch then invokes D's override of the already selected m(A) signature, printing Y twice. The static type C of c changes the visible member set, but both signatures are visible through either receiver in this example. Overload selection followed by dynamic dispatch does not select an overload from the argument's runtime type.

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