{TAIL ~ The process} 4 wherein {HEAD ~ the foaming agent} is itself in the form of a mousse 
{ TAIL ~ The process } 4 wherein { HEAD ~ the foaming agent } is itself in the form of a mousse
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH