In {TAIL ~ some cases} {HEAD ~ protection} of certain reactive functionalities may be necessary to achieve some of the above transformations 
In
In { TAIL ~ some cases } { HEAD ~ protection } of certain reactive functionalities may be necessary to achieve some of the above transformations
REL TAIL TAIL TAIL TAIL TAIL TAIL HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH