p 30 36
a 1 6
a 1 15
a 1 16
a 2 6
a 3 11
a 4 15
a 5 23
a 6 11
a 6 19
a 6 24
a 6 27
a 7 10
a 8 22
a 9 20
a 9 26
a 10 15
a 11 12
a 11 15
a 12 24
a 12 25
a 13 14
a 14 18
a 15 27
a 16 22
a 17 18
a 18 24
a 19 21
a 20 21
a 21 29
a 22 25
a 23 28
a 24 25
a 25 29
a 26 29
a 27 29
a 28 29
