#4 4
#3 3
#9 9
#19 19
#20 20
#23 23
#18 18
#21 21
#22 22
#17 17
#12 12
#11 11
#7 7
#5 5
#6 6
#13 13
#14 14
#15 15
#10 10
#16 16
#8 8
#1 1
#2 2