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