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