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