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