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