The two substrate boats, each configured to hold a set of substrates, may be assembled in a way that {HEAD ~ the two sets} of {TAIL ~ substrates} interleave with one another 
The two substrate boats , each configured to hold a set of substrates , may be assembled in a way that { HEAD ~ the two sets } of { TAIL ~ substrates } interleave with one another
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH