the control circuit selects a second combination of transmission elements from among the plurality of transmission elements so that the second combination of transmission elements is different from the first combination of transmission elements in one of arrangement and {HEAD ~ the number} of {TAIL ~ transmission elements} 
the control circuit selects a second combination of transmission elements from among the plurality of transmission elements so that the second combination of transmission elements is different from the first combination of transmission elements in one of arrangement and { HEAD ~ the number } of { TAIL ~ transmission elements }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL