{HEAD ~ The removable substrate holder} is engaged with {TAIL ~ the substrate boat} such that substrates thereon are interleaving with the susceptors 
is engaged with
{ HEAD ~ The removable substrate holder } is engaged with { TAIL ~ the substrate boat } such that substrates thereon are interleaving with the susceptors
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH