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import java.util.*;
public class Test {
List<B> l;
@Override
Map<String, String> foo() {
HashMap<String, String> m = new HashMap<String, String>();
for (B b : l) {
Map<String, String> map = b.foo();
for (Map.Entry<String, String> entry : map.entrySet()) {
if (!m.containsKey(entry.getKey())) {
m.put(entry.getKey(), entry.getValue());
}
}
}
return m;
}
}
class A {
Map<String, String> foo(){return null;}
}
class B extends A {}
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