Among the orders made by Aimee Bixby, how many of them included at least one kind of product under the category "Furniture"?
made by Aimee Bixby refers to "Customer Name" = 'Aimee Bixby';
SELECT COUNT(DISTINCT T2.`Order ID`) FROM people AS T1 INNER JOIN central_superstore AS T2 ON T1.`Customer ID` = T2.`Customer ID` INNER JOIN product AS T3 ON T3.`Product ID` = T2.`Product ID` WHERE T3.Category = 'Furniture' AND T1.`Customer Name` = 'Aimee Bixby'