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