r=0 in <top>
@2 change in r=0 or b=x
b=0
@3 change in r=0 or b=0
r=1 in <top>
@4 change in r=1 or b=0
b=1
r=2 in <top>
@6 change in r=2 or b=1
r=3 in <top>
@8 change in r=3 or b=1
b=2
@9 change in r=3 or b=2
r=4 in <top>
@10 change in r=4 or b=2
b=3
r=5 in <top>
@12 change in r=5 or b=3
r=6 in <top>
@14 change in r=6 or b=3
b=4
@15 change in r=6 or b=4
r=7 in <top>
@16 change in r=7 or b=4
b=5
r=8 in <top>
@18 change in r=8 or b=5
r=9 in <top>
@20 change in r=9 or b=5
b=6
@21 change in r=9 or b=6
b=14
@26 change in r=9 or b=14
b=16
@31 change in r=9 or b=16
b=18
@36 change in r=9 or b=18
