It should be noted that {HEAD ~ elements} having {TAIL ~ a corresponding function} have been provided with the same reference signs in the different embodiments 
having
It should be noted that { HEAD ~ elements } having { TAIL ~ a corresponding function } have been provided with the same reference signs in the different embodiments
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH