In one embodiment, {HEAD ~ the face mat} has {TAIL ~ a relatively short floor portion} for extension into the earthen formation and an upright portion of an extended height for disposition over the face of the formation 
has
In one embodiment , { HEAD ~ the face mat } has { TAIL ~ a relatively short floor portion } for extension into the earthen formation and an upright portion of an extended height for disposition over the face of the formation
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH