{TAIL ~ at least a portion} of {HEAD ~ said first recess} a being aligned with said second opening 
{ TAIL ~ at least a portion } of { HEAD ~ said first recess } a being aligned with said second opening
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH