The one or more passages may have a serpentine path back and forth along {TAIL ~ cells} of the second plurality, and the passage may connect laterally from cell to cell, within {HEAD ~ cells} of the second plurality, at or near the ends of the body 
The one or more passages may have a serpentine path back and forth along { TAIL ~ cells } of the second plurality , and the passage may connect laterally from cell to cell , within { HEAD ~ cells } of the second plurality , at or near the ends of the body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH