The overhead traveling vehicles travel along {HEAD ~ a travel rail} provided near {TAIL ~ a ceiling}, and the number of the overhead traveling vehicles is, e.g., more than one hundred 
provided near
The overhead traveling vehicles travel along { HEAD ~ a travel rail } provided near { TAIL ~ a ceiling } , and the number of the overhead traveling vehicles is , e.g. , more than one hundred
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH