{HEAD ~ A bottom gate} holds its frozen bait in the tunnel until the blades have sliced the bait into {TAIL ~ pieces} 
{ HEAD ~ A bottom gate } holds its frozen bait in the tunnel until the blades have sliced the bait into { TAIL ~ pieces }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL