Remove Duplicates From Fast

2 Useful links:
http://searchunleashed.wordpress.com/2011/12/08/how-remove-duplicate-results-works-in-fast-search-for-sharepoint/

http://msdn.microsoft.com/en-us/library/ff521593.aspx


Search a specific managed property:
and(string("hello world"), filter(property-spec:or(1, 20, 453, ... , 3473)))
and(string("hello world"), filter(property-spec:int("1 20 453 ... 3473", mode="or")))

Search all strings within specific managed property
and(string("."), filter(managedproperty-spec:or(variableofinput)))