a holder configured to be mounted to the first housing, the holder having {HEAD ~ a first mating part} corresponding to {TAIL ~ the first engagement part}, the holder having a second engagement part for engagement of the first engagement part and the first mating part 
a holder configured to be mounted to the first housing , the holder having { HEAD ~ a first mating part } corresponding to { TAIL ~ the first engagement part } , the holder having a second engagement part for engagement of the first engagement part and the first mating part
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL 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