The two end plates 514 {TAIL ~ each} include an opening 518 into {HEAD ~ the passage} 516 
The two end plates 514 { TAIL ~ each } include an opening 518 into { HEAD ~ the passage } 516
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH