In {TAIL ~ another embodiment}, {HEAD ~ one substrate boat} may be interchangeably plugged into the other 
In { TAIL ~ another embodiment } , { HEAD ~ one substrate boat } may be interchangeably plugged into the other
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH