The blade portion 12b is shaped like {HEAD ~ a boot}, exposing {TAIL ~ its rear side} 
exposing
The blade portion 12b is shaped like { HEAD ~ a boot } , exposing { TAIL ~ its rear side }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL