A first flange extends perpendicularly from the first side of {HEAD ~ the upper surface} of the longitudinal plate and {TAIL ~ an end wall} extends perpendicularly from each one of two ends of the bottom surface 
of
A first flange extends perpendicularly from the first side of { HEAD ~ the upper surface } of the longitudinal plate and { TAIL ~ an end wall } extends perpendicularly from each one of two ends of the bottom surface
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH