In {TAIL ~ another configuration}, {HEAD ~ the bottom ply wall} extends downwardly from the bottom ply lower surface, such that the well is below the bottom ply lower surface 
In
In { TAIL ~ another configuration } , { HEAD ~ the bottom ply wall } extends downwardly from the bottom ply lower surface , such that the well is below the bottom ply lower surface
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH