{TAIL ~ A content} of {HEAD ~ the hydrofluorocarbon} is from 1 to 60 mass % in the working medium for heat cycle 
{ TAIL ~ A content } of { HEAD ~ the hydrofluorocarbon } is from 1 to 60 mass % in the working medium for heat cycle
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH