1
→
4
→
2
→
∅
5
3
8
A
B
C
D
0
cat
1
dog
2
ant
3
fox
1
3
2
7
5
4
6
1
0
1
0
0
1
0
1
1
0
0
1
0
1
1
0
TOP
8
3
1
9
2
5
7
6
F
B
◊
c
d
a
o
o
a
t
3
7
1
9
4
A
B
C
D
1
→
4
→
2
→
∅
1
3
2
7
5
4
6
◊
c
d
a
o
o
a
t
TOP
8
3
1
0
cat
1
dog
2
ant
3
fox
5
3
8
1
0
1
0
0
1
0
1
1
0
0
1
0
1
1
0
9
2
5
7
6
F
B
3
7
1
9
4
A
B
C
D
1
→
4
→
2
→
∅
5
3
8
1
3
2
7
5
4
6
TOP
8
3
1
0
cat
1
dog
2
ant
3
fox
◊
c
d
a
o
o
a
t
1
0
1
0
0
1
0
1
1
0
0
1
0
1
1
0
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