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