{HEAD ~ A slide member} includes a surface layer having {TAIL ~ a slide surface} for a mating member 
{ HEAD ~ A slide member } includes a surface layer having { TAIL ~ a slide surface } for a mating member
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH