While {TAIL ~ such structural beams} exhibit satisfactory strength in tension, compression, and bending, {HEAD ~ these beams} are relatively weak in axial torsion 
While { TAIL ~ such structural beams } exhibit satisfactory strength in tension , compression , and bending , { HEAD ~ these beams } are relatively weak in axial torsion
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH