The combination 2 in which the central portion of each tongue is substantially parallel to {HEAD ~ the web} of {TAIL ~ the associated cross beam} 
of
The combination 2 in which the central portion of each tongue is substantially parallel to { HEAD ~ the web } of { TAIL ~ the associated cross beam }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL