In {TAIL ~ addition}, the entire amount of breaker introduced into {HEAD ~ the formation} is released 
In { TAIL ~ addition } , the entire amount of breaker introduced into { HEAD ~ the formation } is released
OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH