These compositions may also be reused, i.e., used for more than one purging operation, and they may be recycled by incorporating the used purge composition into {HEAD ~ a polymer} which is identical to or compatible with {TAIL ~ the polymer} of the purge composition 
is identical to
These compositions may also be reused , i.e. , used for more than one purging operation , and they may be recycled by incorporating the used purge composition into { HEAD ~ a polymer } which is identical to or compatible with { TAIL ~ the polymer } of the purge composition
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 OTH REL REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH