{TAIL ~ Virgin sand} may be added to the salvaged sand as needed and when virgin sand is added to the salvaged sand, the term the salvaged sand before kneading should be broadly interpreted to include mixture of the salvaged sand and {HEAD ~ the virgin sand} 
{ TAIL ~ Virgin sand } may be added to the salvaged sand as needed and when virgin sand is added to the salvaged sand , the term the salvaged sand before kneading should be broadly interpreted to include mixture of the salvaged sand and { HEAD ~ the virgin sand }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD