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#include <iostream>
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struct S1 { virtual ~S1() = default; };
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struct S2 { virtual void f1() = 0; };
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struct S3: S1, S2 {
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void f1() { f2(); }
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virtual void f2() = 0;
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};
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struct S4: S3 {
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void f2() { std::cout << "called\n"; }
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using S2::f1;
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};
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int main() { S4().f1(); }
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