package Q0;
public abstract class h {
public class a extends h {
public g a(String str) {
return null;
}
}
public static h c() {
return new a();
}
public abstract g a(String str);
public final g b(String str) {
g a4 = a(str);
return a4 == null ? g.a(str) : a4;
}
}
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