Components from sources 220 and 222 are mixed to form {HEAD ~ a mixture} 224 which is flowed into {TAIL ~ reaction chamber} 202 
is flowed into
Components from sources 220 and 222 are mixed to form { HEAD ~ a mixture } 224 which is flowed into { TAIL ~ reaction chamber } 202
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH