{HEAD ~ Useful breaking activators} include acid generating breaking activators, sulfur containing breaking activators and reducing {TAIL ~ agent breaking activators} 
include reducing
{ HEAD ~ Useful breaking activators } include acid generating breaking activators , sulfur containing breaking activators and reducing { TAIL ~ agent breaking activators }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL