{TAIL ~ Control release capsules} comprising a breaker contained within {HEAD ~ a enclosure member} are employed to break fracturing fluids 
{ TAIL ~ Control release capsules } comprising a breaker contained within { HEAD ~ a enclosure member } are employed to break fracturing fluids
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH