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import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import org.checkerframework.checker.compilermsgs.qual.UnknownCompilerMessageKey;
public class Diamonds {
void method(List<String> arrays) {
arrays = new ArrayList<>(new HashSet<>(arrays));
arrays = newArrayList(new HashSet<>(arrays));
arrays = new ArrayList<>(new HashSet<@UnknownCompilerMessageKey String>(arrays));
}
<F> ArrayList<F> newArrayList(Collection<? extends F> param) {
return new ArrayList<>(param);
}
}
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