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