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StringBuffer bf1=new StringBuffer(0);
for (int i = 0; i < 1000000; i++) {
bf1.append(i);
}
StringBuffer bf2=new StringBuffer(0);
for (int i = 0; i < 1000000; i++) {
bf2.append(i);
}
System.out.println(bf1.toString().contains(bf2.toString()));