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1 of 10
4
10
6
8
11
-
1
=
?
2 of 10
9
1
6
4
12
-
8
=
?
3 of 10
7
3
8
6
13
-
5
=
?
4 of 10
12
0
16
15
14
-
2
=
?
5 of 10
6
3
4
5
15
-
9
=
?
6 of 10
16
20
0
14
16
-
0
=
?
7 of 10
0
3
8
17
17
-
17
=
?
8 of 10
6
4
1
9
18
-
9
=
?
9 of 10
3
13
1
16
19
-
6
=
?
10 of 10
17
7
0
3
20
-
3
=
?