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