I just noticed during keyword research that a long tailed keyword without the [ ]s around it generate 5x the traffic of the same longtail keyword string with the [ ] things around it. I clicked the "exact" check box as well as the "show ideas closely related" checkbox. What is the difference? For instance: how to make icecream = 1200 local monthly searches [how to make icecream] = 800 local monthly searches "how to make icecream" = 275 local monthly searches I know what quotes do in a query, but what are the [ ]'s for? Thanks!