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