What products were ordered by the customer ID "WILMK" which were required on 3/26/1998?
required on 3/26/1998 refers to RequiredDate = '1998-03-26 00:00:00'; products ordered refers to ProductName
SELECT T3.ProductName FROM Orders AS T1 INNER JOIN `Order Details` AS T2 ON T1.OrderID = T2.OrderID INNER JOIN Products AS T3 ON T2.ProductID = T3.ProductID WHERE T1.RequiredDate LIKE '1998-03-26%' AND T1.CustomerID = 'WILMK'