In {HEAD ~ such a case}, two word lines are separated only by {TAIL ~ a connecting channel} that enables an electrically conductive connection between a trench filling of the trench capacitor and a bit line 
In { HEAD ~ such a case } , two word lines are separated only by { TAIL ~ a connecting channel } that enables an electrically conductive connection between a trench filling of the trench capacitor and a bit line
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH