Any 6 x 4 6 x 5 6 x 6 7 x 4 7 x 5 7 x 6 7 x 7 8 x 4 8 x 5 8 x 6 8 x 7 8 x 8 9 x 4 9 x 5 9 x 6 9 x 7 9 x 8 9 x 9 10 x 4 10 x 5 10 x 6 10 x 7 10 x 8 10 x 9 10 x 10 11 x 4 11 x 5 11 x 6 11 x 7 11 x 8 11 x 9 11 x 10 12 x 4 12 x 5 12 x 6 12 x 7 12 x 8 12 x 9 12 x 10 13 x 6 13 x 7 13 x 8 13 x 9 13 x 10 14 x 6 14 x 7 14 x 8 14 x 9 14 x 10 15 x 7 15 x 8 15 x 9 15 x 10 16 x 8 16 x 9 16 x 10 17 x 8 17 x 9 17 x 10 18 x 8 18 x 9 18 x 10 19 x 8 19 x 9 19 x 10 20 x 8 20 x 9 20 x 10