f) said second flat side having a second hole complementary to said {HEAD ~ first flat side hole} with {TAIL ~ a catch}; and 
with
f ) said second flat side having a second hole complementary to said { HEAD ~ first flat side hole } with { TAIL ~ a catch } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH