The third merchandiser module is positioned next and coupled to {HEAD ~ the first merchandiser module} and {TAIL ~ the second merchandiser module} 
The third merchandiser module is positioned next and coupled to { HEAD ~ the first merchandiser module } and { TAIL ~ the second merchandiser module }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL