{TAIL ~ The second recovery function}, for example, may be less aggressive than {HEAD ~ the first recovery function} 
{ TAIL ~ The second recovery function } , for example , may be less aggressive than { HEAD ~ the first recovery function }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD