class a
{
int aa;
public:
a(int aaa=0):aa(aaa){}
};
class b:public a
{
int bb;
public:
b(int bbb=0):a(bbb){}
};
class c:public b
{
int ccc;
public:
c(int ccc=0):b(ccc){}
};
int main(){
a aa;
b bb;
c cc;
}
c::int(y):B(y){}
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