The addition of these elements does not complicate {HEAD ~ the manufacture} of {TAIL ~ the devices}, for they are placed at the same level as elements which are in any case necessary in the reading zone 
The addition of these elements does not complicate { HEAD ~ the manufacture } of { TAIL ~ the devices } , for they are placed at the same level as elements which are in any case necessary in the reading zone
OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH