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By Jessi Hempel
A word to Thin Mint lovers everywhere: Don't cheat the Girl Scouts. Across the country, scout troops are stepping up efforts to collect from delinquent cookie consumers. The venerable organization recently hired OldDebts.com, an online debt-collection service, to send 2,000 collection letters to deadbeats in one Midwestern state alone. And councils from Washington, D.C., to San Diego have also hired debt pay-