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