1 p 2 m 2 p 3 m 3 p 4 m 4 p 5 m 5 p 6 m 7 m 8 m 9 m 10 m 11 m 12 m 13 m 14 m 15 m 16 m 17 m 18 m 19 m 20 m 21 m
