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