{TAIL ~ The fluid} containing the photosensitizer may be flowed into {HEAD ~ a photopermeable container} for irradiation 
{ TAIL ~ The fluid } containing the photosensitizer may be flowed into { HEAD ~ a photopermeable container } for irradiation
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH