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 {HEAD ~ mixture} of the salvaged sand and {TAIL ~ the virgin sand} 
of
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 { HEAD ~ mixture } of the salvaged sand and { TAIL ~ the virgin sand }
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 REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL