An electric system for use in {HEAD ~ a structure} which includes a first body and {TAIL ~ a second body}, said second body being movable relative to said first body, said system comprising: 
An electric system for use in { HEAD ~ a structure } which includes a first body and { TAIL ~ a second body } , said second body being movable relative to said first body , said system comprising :
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH