accept {HEAD ~ first additional data} received from {TAIL ~ the second data enterer} into the system if the data is entered in a format compliant with a second set of rules 
received from
accept { HEAD ~ first additional data } received from { TAIL ~ the second data enterer } into the system if the data is entered in a format compliant with a second set of rules
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH