{HEAD ~ The apparatus} 5, comprising {TAIL ~ an automated optical observation system} for detecting and enumerating the immobilized entities 
comprising
{ HEAD ~ The apparatus } 5 , comprising { TAIL ~ an automated optical observation system } for detecting and enumerating the immobilized entities
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH