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