{HEAD ~ The body} has {TAIL ~ a portion} defining an engagement hole into which the free end portion projects to engage the wall of the engagement hole when the cover closes the body, and from which the free end portion projects out of the engagement with the wall when the cover is moved in the opening direction 
{ HEAD ~ The body } has { TAIL ~ a portion } defining an engagement hole into which the free end portion projects to engage the wall of the engagement hole when the cover closes the body , and from which the free end portion projects out of the engagement with the wall when the cover is moved in the opening direction
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH