Count function to identify duplicates

Count function to identify duplicates

I've been using the count function to identify duplicate records from several fields in a form. I've used && between count formulae to indicate each field value must be identical to those of an existing record for a duplicate to be identified. However this seems to have the behaviour of identifying any record that has a field value identical to the one specified in the new record. 

How would I adapt this to ensure all field values in the new record are identical to one and only one previous record?