CountDuplicates
fNumDuplicates = node->CountDuplicates(fDuplicateNode,
fNumDuplicates = node->CountDuplicates(offset, fIsFragment);
uint8 CountDuplicates(off_t offset,
fNumDuplicates = node->CountDuplicates(fDuplicateNode,false);
fNumDuplicates = node->CountDuplicates(offset,fIsFragment);
uint8 CountDuplicates(off_t offset, bool isFragment) const;