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2
1
7
6
7
8
2
3
3
6
*
x
-
3
1
9
5
3
3
5
0
7
0
7
2
0
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x
+
1
6
2
2
2
3
1
9
1
9
3
6
0
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x
+
1
0
3
0
5
2
6
6
1
8
0
4
0
0
0
0
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x
+
6
1
5
2
9
2
3
7
9
4
1
5
0
0
0
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-
1
8
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1
2
4
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8
7
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3
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=
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