{HEAD ~ The third arm} has {TAIL ~ at least one resiliently deformable lobe section} between its distal and proximal ends to allow movement of the proximal end relative to the distal end of the third arm 
has
{ HEAD ~ The third arm } has { TAIL ~ at least one resiliently deformable lobe section } between its distal and proximal ends to allow movement of the proximal end relative to the distal end of the third arm
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL 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