Giving the following class definitions, how many subobjects of class V in class X?

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Giving the following class definitions, how many subobjects of class V in class X?
class V { /* ... */ };
class B1 : virtual public V { /* ... */ };
class B2 : virtual public V { /* ... */ };
class B3 : public V { /* ... */ };
class X : public B1, public B2, public B3 { /* ... */};

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