a substrate disposed inside a housing, the substrate including {HEAD ~ a substrate surface} occupying the most surface area of any surface of {TAIL ~ the substrate} 
a substrate disposed inside a housing , the substrate including { HEAD ~ a substrate surface } occupying the most surface area of any surface of { TAIL ~ the substrate }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL