Drag and drop: correct answer is a specific combination of objects

I am trying to create a drag and drop for the following problem: "Penny Penguin has some shapes hidden in her igloo. Together, the shapes have 5 faces. What shapes could be in her igloo?" Students drag and drop from an array of seven different shapes onto the igloo. There are multiple correct answers, each of which is a particular combination of shapes (ex: 1 cylinder and 3 cones OR 5 cones OR 1 pyramid OR 2 cylinders and 1 cone). I want to set a trigger to jump to the next slide when the student drags and drops any one of the correct combinations of shapes. I tried setting triggers for each shape that was part of a correct combination, with conditions that the other shapes in that combination had to be 'equal to' 'dropped on' 'correct'. No luck - all the shapes that are part of a correct combination stay in the igloo, but putting in a correct or incorrect combination does not trigger the next slide. Any ideas?