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original.java

@Override public boolean containsAll(Collection<?> targets) {
  try {
    return range.containsAll((Iterable<? extends C>) targets);
  } catch (ClassCastException e) {
    return false;
  }
}

modified.java

@Override public boolean containsAll(Collection<?> targets) {
  return Collections2.containsAllImpl(this, targets);
}