In {HEAD ~ addition}, the release of the breaker can be effected in {TAIL ~ a relatively controlled manner} 
In { HEAD ~ addition } , the release of the breaker can be effected in { TAIL ~ a relatively controlled manner }
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL