Supermarket taxonomy is an inexact science. We’ve all stood at the mouth of a seemingly infinite grocery store aisle, transfixed by the six or so organizational terms floating above us on a hanging sign. We stand there flummoxed, lost in slovenly calculation. What is a lentil? A bean? Is it lumped with the canned goods? An organic specialty? Hell, does it qualify for the “ethnic” section? After draining consideration, we either deem the aisle invalid and refresh the process elsewhere or step down a corridor of uncertainty with gnawing self-doubt. Management at the Associated on Flatbush between Hawthorne Street and Fenimore has clearly run into similar complications