{HEAD ~ The ends} of the beams may be modified to form joints which are used to connect {TAIL ~ two beams} together or to connect the beam to another construction material 
{ HEAD ~ The ends } of the beams may be modified to form joints which are used to connect { TAIL ~ two beams } together or to connect the beam to another construction material
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH