receive {HEAD ~ first additional data} from {TAIL ~ a second data enterer}, the first additional data being related to the data received from the first data enterer 
receive { HEAD ~ first additional data } from { TAIL ~ a second data enterer } , the first additional data being related to the data received from the first data enterer
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH