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