Seven boxes, H, I, J, K, E, F and G, are kept one over the other, but not necessarily in the same order. Only three boxes are kept between I and K. F is kept at the third position from the top. I is kept at one of the positions above F, but not at one of the positions above E. Only H is kept below K, G is not kept immediately below F. Which box is kept at the fourth position from the bottom?