said vertical legs being at least partially inserted into {TAIL ~ said associated pair} of {HEAD ~ holes}; and 
said vertical legs being at least partially inserted into { TAIL ~ said associated pair } of { HEAD ~ holes } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH