Use the Unique List function to 'de-dupe' your data!!
Just as you would use DISTINCT in SQL or UNIQUE() in Excel, you can use the Unique LList add-on function in Squirrel to return a distinct list of values.
Super easy to use. You simply select the source (range containing the data that includes duplicate values) and destination (place where you want to put the unique list).
Each time the source changes, the destination will automagically update :)