{HEAD ~ A portable electronic device} includes a main body , a cover , and {TAIL ~ a battery}  
includes
{ HEAD ~ A portable electronic device } includes a main body , a cover , and { TAIL ~ a battery }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH