Thus, {HEAD ~ a difference} between a power flowing through the input wire 7A and {TAIL ~ a power} flowing through the output wire 7B is big 
between
Thus , { HEAD ~ a difference } between a power flowing through the input wire 7A and { TAIL ~ a power } flowing through the output wire 7B is big
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH