{HEAD ~ Various connectors} which have lengths much shorter than the lengths of the beams are provided for attaching {TAIL ~ one beam} to another 
{ HEAD ~ Various connectors } which have lengths much shorter than the lengths of the beams are provided for attaching { TAIL ~ one beam } to another
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH