2.9 x 3 cm 4.9 x 5 cm 5.9 x 6 cm 6.9 x 7 cm 7.9 x 8 cm 8.8 x 9 cm 11.8 x 12 cm 14.7 x 15 cm 18.7 x 19 cm 21.6 x 22 cm