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8
+
7
=
11
+
()
18
-
3
=
11
+
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13
-
11
=
21
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20
-
7
=
4
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6
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6
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1
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13
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4
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11
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18
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15
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5
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6
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1
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15
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13
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11
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6
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3
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11
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18
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18
=
15
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19
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15
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20
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18
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1
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18
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6
=
13
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15
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3
=
15
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10
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9
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2
+
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21
-
0
=
5
+
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10
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7
=
12
+
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20
-
14
=
19
-
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19
-
10
=
20
-
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10
-
10
=
7
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7
+
2
=
8
+
()
6
+
4
=
18
-
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7
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3
=
9
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()
13
-
10
=
16
-
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10
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0
=
7
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17
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14
=
17
-
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18
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12
=
6
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10
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9
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18
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10
-
10
=
18
-
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19
-
10
=
20
-
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8
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8
=
6
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1
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1
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14
-
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13
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6
=
8
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12
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1
=
8
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14
-
10
=
6
-
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13
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11
=
12
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11
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1
=
13
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17
-
14
=
0
+
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10
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3
=
13
+
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17
-
3
=
2
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()
15
-
9
=
9
-
()
11
+
0
=
4
+
()
20
-
3
=
3
+
()
6
+
5
=
4
+
()
18
-
10
=
5
+
()
17
-
10
=
10
-
()
16
+
3
=
1
+
()
7
+
4
=
12
-
()
2
+
0
=
14
-
()
12
-
9
=
18
-
()
14
+
2
=
19
-
()
18
-
4
=
8
+
()
18
-
10
=
5
+
()
19
-
7
=
9
+
()
17
-
4
=
9
+
()
18
-
6
=
8
+
()
7
+
6
=
13
+
()
5
+
3
=
18
-
()
10
+
2
=
12
+
()
18
-
7
=
18
-
()
18
-
18
=
17
-
()
13
+
3
=
10
+
()
10
+
8
=
10
+
()
5
+
3
=
14
-
()
12
-
9
=
20
-
()
16
-
13
=
2
+
()
19
-
17
=
19
-
()
19
-
9
=
11
-
()
14
-
9
=
12
-
()
9
+
3
=
14
-
()
17
-
13
=
12
-
()
15
+
1
=
12
+
()
18
-
7
=
18
-
()
16
-
11
=
15
-
()
20
-
18
=
11
-
()
4
+
1
=
4
+
()
21
-
4
=
7
+
()
12
+
3
=
5
+
()
11
+
3
=
7
+
()
16
-
8
=
8
+
()
20
-
19
=
5
-
()
15
+
4
=
16
+
()
17
-
9
=
5
+
()
21
-
15
=
18
-
()
16
-
5
=
5
+
()
16
-
4
=
6
+
()
6
+
3
=
0
+
()
7
+
1
=
19
-
()
10
+
1
=
8
+
()
11
+
3
=
17
-
()
9
+
1
=
6
+
()
6
+
4
=
6
+
()
17
+
2
=
5
+
()
17
+
1
=
11
+
()
14
-
8
=
9
-
()
19
-
16
=
14
-
()
9
+
7
=
8
+
()
5
+
4
=
21
-
()
15
+
0
=
5
+
()
19
-
8
=
16
-
()
21
-
4
=
10
+
()
18
-
10
=
4
+
()
19
-
18
=
6
-
()
19
-
2
=
14
+
()
15
+
3
=
20
-
()
8
+
5
=
6
+
()
12
-
11
=
2
-
()
12
+
6
=
16
+
()
20
-
11
=
14
-
()
16
-
5
=
16
-
()
16
+
0
=
5
+
()
15
-
12
=
16
-
()
20
-
13
=
13
-
()
12
-
10
=
19
-
()
20
-
3
=
17
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()
13
+
1
=
1
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14
+
2
=
19
-
()
14
+
0
=
15
-
()
12
-
10
=
6
-
()
18
-
2
=
2
+
()
16
+
1
=
13
+
()
12
+
2
=
20
-
()
9
+
0
=
12
-
()
13
-
8
=
19
-
()
7
+
3
=
9
+
()
11
+
5
=
1
+
()
15
-
8
=
16
-
()
19
-
5
=
20
-
()
13
+
5
=
13
+
()
20
-
13
=
13
-
()
12
+
3
=
14
+
()
4
+
2
=
8
-
()
17
+
0
=
19
-
()
7
+
0
=
19
-
()
5
+
1
=
8
-
()
19
-
10
=
4
+
()
16
+
0
=
15
+
()
21
-
7
=
20
-
()
12
+
4
=
5
+
()
17
-
7
=
16
-
()
10
+
6
=
20
-
()
17
-
16
=
12
-
()
19
+
0
=
1
+
()
17
-
10
=
3
+
()
6
+
3
=
17
-
()
18
-
7
=
8
+
()
10
+
1
=
18
-
()
14
+
2
=
3
+
()
18
-
8
=
1
+
()
19
-
15
=
14
-
()
16
-
6
=
9
+
()
13
-
9
=
11
-
()
20
-
8
=
4
+
()
17
-
3
=
19
-
()
15
-
13
=
14
-
()
20
-
2
=
5
+
()
19
-
17
=
2
+
()
5
+
2
=
3
+
()
15
+
2
=
13
+
()
21
-
12
=
5
+
()
7
+
3
=
1
+
()
9
+
5
=
4
+
()
17
-
9
=
15
-
()
4
+
0
=
15
-
()
19
-
12
=
18
-
()
11
-
11
=
5
-
()
17
-
15
=
7
-
()
12
+
6
=
6
+
()
21
-
1
=
13
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7
+
6
=
5
+
()
15
+
1
=
9
+
()
12
+
2
=
17
-
()
20
-
2
=
3
+
()
18
-
18
=
8
-
()
21
-
17
=
3
+
()
16
-
10
=
16
-
()
15
-
7
=
12
-
()
12
-
10
=
6
-
()
8
+
2
=
10
+
()
10
+
6
=
5
+
()
15
-
15
=
16
-
()
17
-
14
=
21
-
()
11
+
1
=
3
+
()
4
+
2
=
1
+
()
11
+
5
=
20
-
()
20
-
2
=
18
+
()
14
+
3
=
2
+
()
9
+
5
=
20
-
()
18
-
16
=
11
-
()
6
+
3
=
14
-
()
10
+
4
=
1
+
()
8
+
2
=
12
-
()
21
-
13
=
7
+
()
16
-
13
=
10
-
()
6
+
1
=
4
+
()
19
-
13
=
19
-
()
4
+
2
=
18
-
()
3
+
3
=
0
+
()
19
-
9
=
1
+
()
20
-
10
=
7
+
()
21
-
18
=
1
+
()
18
-
8
=
18
-
()
17
+
1
=
17
+
()
15
-
14
=
1
+
()
20
-
11
=
17
-
()
8
+
4
=
18
-
()
11
+
6
=
9
+
()
19
-
6
=
13
+
()
14
+
1
=
7
+
()
6
+
1
=
5
+
()
7
+
5
=
20
-
()
14
-
11
=
18
-
()
16
-
16
=
0
+
()
9
+
4
=
8
+
()
10
+
6
=
9
+
()
16
-
10
=
20
-
()
9
+
5
=
12
+
()
17
-
15
=
15
-
()
12
-
8
=
14
-
()
18
-
5
=
8
+
()
19
-
17
=
1
+
()
16
-
10
=
1
+
()
14
-
14
=
4
-
()
18
-
4
=
5
+
()
16
-
6
=
6
+
()
15
-
5
=
15
-
()
6
+
3
=
6
+
()
8
+
7
=
4
+
()
19
-
2
=
8
+
()
3
+
1
=
18
-
()
16
-
9
=
12
-
()
3
+
3
=
3
+
()
17
-
10
=
1
+
()
9
+
5
=
16
-
()
19
-
16
=
13
-
()
18
-
12
=
13
-
()
8
+
1
=
16
-
()
6
+
4
=
20
-
()
7
+
7
=
4
+
()
20
-
12
=
11
-
()
20
-
14
=
5
+
()
10
+
5
=
13
+
()
7
+
1
=
8
+
()
19
-
3
=
20
-
()
10
+
3
=
7
+
()
11
-
10
=
1
+
()
18
-
5
=
20
-
()
15
+
1
=
1
+
()
13
-
7
=
9
-
()
14
-
10
=
11
-
()
6
+
3
=
4
+
()
12
-
10
=
18
-
()
17
-
14
=
10
-
()
14
+
5
=
2
+
()
10
+
2
=
7
+
()
5
+
4
=
4
+
()
21
-
2
=
2
+
()
7
+
2
=
13
-
()
4
+
1
=
0
+
()
2
+
1
=
14
-
()
16
-
6
=
1
+
()
14
-
7
=
11
-
()
18
-
7
=
12
-
()
11
+
1
=
9
+
()
14
+
1
=
4
+
()
12
+
1
=
2
+
()
13
+
3
=
13
+
()
8
+
5
=
19
-
()
10
+
5
=
1
+
()
12
-
9
=
8
-
()
19
-
15
=
21
-
()
18
-
12
=
2
+
()
13
+
1
=
1
+
()
21
-
8
=
1
+
()
19
-
1
=
8
+
()
8
+
8
=
13
+
()
12
+
2
=
3
+
()
20
-
14
=
2
+
()
19
-
11
=
15
-
()
20
-
1
=
7
+
()
20
-
3
=
3
+
()
17
-
4
=
5
+
()
13
+
2
=
7
+
()
4
+
1
=
18
-
()
15
-
8
=
8
-
()
7
+
0
=
20
-
()
6
+
2
=
13
-
()
10
+
1
=
6
+
()
21
-
16
=
9
-
()
19
-
11
=
8
+
()
13
+
5
=
2
+
()
19
-
7
=
19
-
()
19
-
10
=
6
+
()
16
-
13
=
15
-
()
21
-
4
=
3
+
()
3
+
1
=
9
-
()
18
+
1
=
4
+
()
20
-
15
=
17
-
()
9
+
1
=
21
-
()
9
+
8
=
12
+
()
19
-
13
=
4
+
()
19
-
1
=
6
+
()
13
-
11
=
20
-
()
16
-
10
=
14
-
()
10
+
5
=
18
-
()
18
-
7
=
5
+
()
9
+
8
=
20
-
()
11
+
8
=
10
+
()
20
-
20
=
11
-
()
5
+
1
=
8
-
()
17
-
7
=
12
-
()
16
-
15
=
14
-
()
21
-
5
=
2
+
()
12
+
7
=
14
+
()
13
-
8
=
17
-
()
20
-
9
=
19
-
()
14
+
3
=
1
+
()
15
-
10
=
6
-
()
19
-
10
=
20
-
()
2
+
1
=
19
-
()
12
+
3
=
16
-
()
19
-
3
=
16
+
()
15
+
4
=
3
+
()
18
-
16
=
20
-
()
21
-
13
=
8
+
()
18
-
12
=
17
-
()
14
-
8
=
19
-
()
14
-
12
=
12
-
()
17
-
16
=
10
-
()
15
-
9
=
13
-
()
19
-
19
=
16
-
()
15
-
8
=
21
-
()
11
+
7
=
21
-
()
17
-
13
=
2
+
()
20
-
20
=
17
-
()
20
-
7
=
10
+
()
6
+
3
=
18
-
()
13
-
7
=
2
+
()
18
-
14
=
6
-
()
18
-
14
=
20
-
()
17
-
11
=
12
-
()
6
+
1
=
8
-
()
11
+
7
=
11
+
()
2
+
0
=
4
-
()
21
-
19
=
7
-
()
20
-
12
=
4
+
()
9
+
5
=
19
-
()
5
+
2
=
1
+
()
19
-
10
=
4
+
()
20
-
6
=
0
+
()
9
+
1
=
12
-
()
15
-
12
=
17
-
()
17
-
7
=
8
+
()
14
-
9
=
4
+
()
2
+
0
=
0
+
()
20
-
16
=
2
+
()
11
+
8
=
0
+
()
17
-
17
=
1
-
()
7
+
1
=
19
-
()
20
-
7
=
5
+
()
12
+
1
=
13
+
()
8
+
1
=
5
+
()
11
+
0
=
7
+
()
15
+
4
=
8
+
()
3
+
1
=
4
+
()
8
+
2
=
13
-
()
3
+
3
=
3
+
()
21
-
15
=
2
+
()
4
+
4
=
0
+
()
17
-
7
=
17
-
()
20
-
12
=
12
-
()
12
+
7
=
12
+
()
15
+
3
=
7
+
()
12
-
8
=
3
+
()
14
+
4
=
13
+
()
9
+
8
=
4
+
()
16
-
10
=
11
-
()
12
+
2
=
8
+
()
19
-
16
=
11
-
()
14
+
3
=
17
+
()
19
-
11
=
1
+
()
11
+
1
=
6
+
()
2
+
1
=
2
+
()
18
-
13
=
19
-
()
11
+
8
=
19
+
()
21
-
12
=
7
+
()
16
-
9
=
14
-
()
9
+
4
=
17
-
()
18
-
7
=
18
-
()
21
-
8
=
5
+
()
17
-
12
=
5
+
()
2
+
0
=
12
-
()
20
-
14
=
10
-
()
5
+
4
=
17
-
()
17
-
8
=
5
+
()
16
+
1
=
19
-
()
16
-
8
=
13
-
()
14
-
6
=
17
-
()
6
+
3
=
12
-
()
12
-
8
=
4
+
()
14
-
8
=
14
-
()
10
+
6
=
5
+
()
7
+
7
=
13
+
()
17
+
2
=
10
+
()
10
+
8
=
8
+
()
20
-
12
=
20
-
()
4
+
0
=
14
-
()
11
+
6
=
19
-
()
13
+
3
=
16
+
()
10
+
5
=
4
+
()
21
-
5
=
1
+
()
16
-
9
=
3
+
()
14
+
5
=
11
+
()
14
+
4
=
5
+
()
17
-
14
=
11
-
()
12
+
5
=
14
+
()
20
-
4
=
3
+
()
20
-
13
=
4
+
()
19
-
4
=
20
-
()
7
+
2
=
18
-
()
19
-
18
=
10
-
()
18
-
13
=
11
-
()
21
-
2
=
9
+
()
13
+
3
=
2
+
()
10
+
8
=
7
+
()
11
+
8
=
12
+
()
13
-
13
=
5
-
()
15
-
8
=
20
-
()
15
-
8
=
7
+
()
11
+
6
=
2
+
()
20
-
10
=
6
+
()
20
-
1
=
1
+
()
9
+
3
=
4
+
()
6
+
6
=
11
+
()
21
-
2
=
8
+
()
13
+
1
=
8
+
()
14
+
2
=
1
+
()
6
+
6
=
14
-
()
12
+
6
=
12
+
()
13
+
5
=
15
+
()
17
+
1
=
17
+
()
17
-
6
=
10
+
()
11
+
6
=
18
-
()
20
-
4
=
16
+
()
17
-
6
=
10
+
()
7
+
5
=
8
+
()
13
+
4
=
6
+
()
10
+
4
=
18
-
()
14
-
12
=
11
-
()
13
-
8
=
14
-
()
18
-
17
=
15
-
()
20
-
16
=
18
-
()
17
-
8
=
3
+
()
14
+
5
=
4
+
()
10
-
10
=
7
-
()
10
+
9
=
3
+
()
6
+
1
=
1
+
()
10
+
8
=
10
+
()
12
+
3
=
8
+
()
17
-
14
=
14
-
()
20
-
9
=
20
-
()
20
-
16
=
2
+
()
18
-
10
=
15
-
()
11
-
9
=
20
-
()
14
+
3
=
21
-
()
5
+
2
=
10
-
()
2
+
1
=
13
-
()
20
-
15
=
2
+
()
15
-
13
=
10
-
()
17
-
15
=
10
-
()
19
-
1
=
10
+
()
17
-
3
=
13
+
()
7
+
5
=
19
-
()
19
-
12
=
9
-
()
9
+
5
=
13
+
()
21
-
3
=
19
-
()
14
-
6
=
3
+
()
12
+
4
=
5
+
()
17
-
16
=
6
-
()
20
-
11
=
18
-
()
19
-
17
=
21
-
()
19
-
11
=
20
-
()
11
+
3
=
15
-
()
9
+
0
=
6
+
()
20
-
18
=
15
-
()
13
+
5
=
12
+
()
16
+
3
=
20
-
()
20
-
7
=
7
+
()
20
-
9
=
10
+
()
14
+
1
=
17
-
()
15
+
3
=
13
+
()
11
+
4
=
9
+
()
4
+
4
=
21
-
()
13
+
6
=
19
+
()
9
+
7
=
10
+
()
12
+
5
=
7
+
()
3
+
2
=
14
-
()
19
-
1
=
20
-
()
5
+
5
=
4
+
()
19
-
4
=
15
+
()
20
-
7
=
14
-
()
16
-
7
=
21
-
()
18
-
3
=
13
+
()
9
+
4
=
16
-
()
5
+
3
=
6
+
()
9
+
6
=
15
+
()
14
-
12
=
0
+
()
12
+
7
=
18
+
()
20
-
16
=
3
+
()
20
-
18
=
19
-
()
13
-
11
=
20
-
()
19
-
4
=
2
+
()
17
+
1
=
6
+
()
5
+
4
=
2
+
()
19
-
7
=
20
-
()
20
-
8
=
1
+
()
20
-
2
=
13
+
()
8
+
1
=
3
+
()
16
-
11
=
8
-
()
20
-
17
=
18
-
()
16
-
15
=
5
-
()
10
-
10
=
20
-
()
20
-
18
=
12
-
()
11
+
0
=
6
+
()
6
+
4
=
3
+
()
14
-
6
=
7
+
()
19
-
14
=
6
-
()
19
+
0
=
8
+
()
17
-
14
=
6
-
()
19
-
9
=
8
+
()
16
+
1
=
11
+
()
16
-
7
=
14
-
()
18
-
3
=
18
-
()
17
-
15
=
19
-
()
14
-
6
=
6
+
()
17
-
8
=
4
+
()
3
+
1
=
19
-
()
16
-
8
=
10
-
()
19
-
9
=
12
-
()
12
+
1
=
1
+
()
9
+
9
=
3
+
()
17
-
8
=
18
-
()
17
-
4
=
6
+
()
17
-
3
=
2
+
()
20
-
11
=
6
+
()
7
+
6
=
8
+
()
13
+
0
=
20
-
()
21
-
13
=
4
+
()
21
-
19
=
9
-
()
15
-
9
=
21
-
()
12
+
3
=
3
+
()
7
+
1
=
15
-
()
17
-
8
=
11
-
()
14
-
8
=
12
-
()
18
-
12
=
11
-
()
19
-
7
=
16
-
()
10
-
10
=
14
-
()
19
+
0
=
13
+
()
7
+
5
=
5
+
()
8
+
6
=
14
+
()
16
-
13
=
21
-
()
20
-
3
=
11
+
()
12
-
12
=
11
-
()
7
+
6
=
12
+
()
7
+
3
=
6
+
()
19
-
17
=
4
-
()
6
+
0
=
5
+
()
19
+
0
=
14
+
()
8
+
0
=
10
-
()
17
-
13
=
4
+
()
5
+
5
=
20
-
()
13
+
1
=
12
+
()
16
-
4
=
9
+
()
15
-
6
=
6
+
()
19
-
1
=
20
-
()
12
-
11
=
11
-
()
9
+
0
=
2
+
()
15
+
2
=
14
+
()
11
+
5
=
15
+
()
17
-
13
=
14
-
()
21
-
16
=
1
+
()
11
+
3
=
7
+
()
14
-
11
=
10
-
()
18
-
11
=
7
+
()
18
-
4
=
12
+
()
9
+
2
=
17
-
()
19
-
7
=
19
-
()
19
-
5
=
7
+
()
9
+
1
=
3
+
()
13
+
5
=
20
-
()
15
-
7
=
5
+
()
18
-
16
=
1
+
()
16
-
4
=
20
-
()
17
-
13
=
0
+
()
18
-
4
=
0
+
()
5
+
2
=
18
-
()
19
-
13
=
13
-
()
17
-
11
=
4
+
()
12
-
8
=
17
-
()
13
-
10
=
16
-
()
9
+
7
=
13
+
()
11
+
8
=
8
+
()
17
-
7
=
0
+
()
18
+
0
=
5
+
()
14
-
12
=
13
-
()
14
+
1
=
12
+
()
19
-
12
=
2
+
()
19
-
6
=
1
+
()
9
+
4
=
9
+
()
14
-
10
=
5
-
()
16
-
13
=
9
-
()
13
+
2
=
21
-
()
20
-
18
=
16
-
()
12
+
4
=
7
+
()
16
-
14
=
9
-
()
5
+
1
=
5
+
()
16
-
16
=
1
-
()
20
-
10
=
21
-
()
10
+
1
=
20
-
()
18
-
16
=
20
-
()
21
-
13
=
14
-
()
20
-
8
=
1
+
()
18
-
14
=
1
+
()
10
+
6
=
19
-
()
16
-
4
=
6
+
()
10
+
3
=
2
+
()
16
-
15
=
15
-
()
19
-
13
=
6
+
()
18
-
2
=
3
+
()
6
+
1
=
16
-
()
6
+
4
=
16
-
()
11
+
5
=
1
+
()
2
+
0
=
4
-
()
13
+
2
=
1
+
()
20
-
14
=
11
-
()
19
-
14
=
9
-
()
15
-
14
=
8
-
()
3
+
2
=
1
+
()
7
+
2
=
16
-
()
18
-
2
=
16
+
()
9
+
2
=
21
-
()
3
+
3
=
1
+
()
19
-
8
=
12
-
()
21
-
5
=
12
+
()
20
-
3
=
10
+
()
8
+
2
=
0
+
()
4
+
2
=
10
-
()
18
-
12
=
5
+
()
20
-
8
=
11
+
()
11
+
5
=
17
-
()
19
-
11
=
7
+
()
5
+
0
=
4
+
()
9
+
1
=
1
+
()
17
-
5
=
15
-
()
19
-
6
=
6
+
()
18
-
8
=
0
+
()
15
+
3
=
4
+
()
17
-
11
=
14
-
()
21
-
7
=
20
-
()
17
-
8
=
4
+
()
12
+
0
=
15
-
()
15
-
6
=
17
-
()
17
-
14
=
6
-
()
7
+
4
=
17
-
()
14
-
9
=
3
+
()
14
+
2
=
11
+
()
4
+
4
=
21
-
()
7
+
2
=
10
-
()
5
+
3
=
9
-
()
13
+
1
=
13
+
()
14
-
9
=
5
+
()
20
-
15
=
15
-
()
18
-
16
=
8
-
()
18
-
15
=
6
-
()
13
-
12
=
18
-
()
7
+
5
=
2
+
()
15
-
6
=
9
+
()
17
-
16
=
19
-
()
18
-
4
=
1
+
()
20
-
11
=
9
+
()
18
-
14
=
1
+
()
15
-
8
=
11
-
()
14
+
4
=
15
+
()
3
+
1
=
13
-
()
18
-
9
=
10
-
()
19
-
18
=
0
+
()
18
-
12
=
8
-
()
18
-
3
=
15
+
()
20
-
4
=
5
+
()
2
+
0
=
15
-
()
7
+
2
=
8
+
()
20
-
7
=
9
+
()
10
+
0
=
7
+
()
19
-
4
=
9
+
()
8
+
2
=
4
+
()
21
-
14
=
8
-
()
7
+
5
=
7
+
()
7
+
1
=
2
+
()
4
+
2
=
8
-
()
15
-
12
=
7
-
()
15
-
8
=
3
+
()
3
+
1
=
21
-
()
13
+
6
=
13
+
()
8
+
8
=
14
+
()
12
-
8
=
17
-
()
7
+
1
=
7
+
()
19
-
19
=
17
-
()
6
+
5
=
9
+
()
16
-
14
=
2
+
()
21
-
20
=
6
-
()
16
+
2
=
19
-
()
12
+
4
=
2
+
()
13
+
3
=
3
+
()
18
-
13
=
9
-
()
8
+
6
=
10
+
()
16
-
13
=
19
-
()
6
+
4
=
4
+
()
20
-
13
=
3
+
()
8
+
4
=
7
+
()
13
-
7
=
12
-
()
9
+
9
=
4
+
()
21
-
17
=
1
+
()
21
-
13
=
16
-
()
20
-
6
=
2
+
()
9
+
4
=
14
-
()
18
-
8
=
14
-
()
18
+
1
=
4
+
()
9
+
0
=
17
-
()
20
-
4
=
8
+
()
5
+
2
=
20
-
()
13
+
3
=
4
+
()
7
+
5
=
5
+
()
16
-
15
=
10
-
()
16
-
8
=
7
+
()
20
-
12
=
7
+
()
20
-
9
=
16
-
()
10
+
2
=
4
+
()
13
+
3
=
14
+
()
21
-
7
=
0
+
()
19
-
15
=
8
-
()
10
+
9
=
18
+
()
15
+
3
=
11
+
()
20
-
10
=
4
+
()
20
-
4
=
0
+
()
8
+
4
=
16
-
()
12
+
2
=
8
+
()
19
-
12
=
4
+
()
9
+
3
=
18
-
()
11
+
8
=
4
+
()
16
-
10
=
3
+
()
6
+
3
=
1
+
()
18
-
8
=
21
-
()
15
+
2
=
17
+
()
21
-
0
=
11
+
()
16
+
1
=
9
+
()
15
-
12
=
15
-
()
18
-
6
=
8
+
()
17
-
15
=
20
-
()
9
+
0
=
1
+
()
11
-
9
=
13
-
()
18
-
8
=
1
+
()
20
-
1
=
7
+
()
16
-
12
=
13
-
()
21
-
9
=
3
+
()
17
-
9
=
2
+
()
21
-
3
=
2
+
()
20
-
18
=
19
-
()
10
+
7
=
8
+
()
7
+
6
=
17
-
()
14
+
4
=
8
+
()
13
+
1
=
12
+
()
18
-
2
=
7
+
()
19
-
7
=
17
-
()
11
-
11
=
6
-
()
16
-
15
=
17
-
()
15
-
9
=
13
-
()
15
-
13
=
8
-
()
3
+
1
=
11
-
()
14
-
6
=
20
-
()
11
-
11
=
5
-
()
17
-
6
=
3
+
()
8
+
1
=
12
-
()
17
+
2
=
13
+
()
15
-
12
=
5
-
()
17
-
3
=
1
+
()
19
-
2
=
19
-
()
18
-
5
=
18
-
()
6
+
3
=
4
+
()
17
-
16
=
16
-
()
5
+
3
=
15
-
()
13
-
8
=
9
-
()
18
-
12
=
16
-
()
21
-
11
=
19
-
()
21
-
15
=
8
-
()
16
-
12
=
13
-
()
5
+
2
=
7
+
()
12
+
5
=
13
+
()
18
-
9
=
2
+
()
19
-
1
=
4
+
()
18
-
2
=
14
+
()
20
-
13
=
14
-
()
6
+
1
=
11
-
()
13
+
6
=
5
+
()
19
-
16
=
8
-
()
4
+
1
=
3
+
()
19
-
3
=
4
+
()
16
-
8
=
12
-
()
14
-
12
=
9
-
()
17
-
14
=
6
-
()
5
+
3
=
9
-
()
21
-
17
=
12
-
()
12
+
7
=
11
+
()
14
-
7
=
12
-
()
20
-
3
=
10
+
()
16
-
6
=
10
+
()
11
+
0
=
17
-
()
20
-
2
=
0
+
()
20
-
17
=
13
-
()
14
-
13
=
21
-
()
14
-
6
=
2
+
()
18
-
2
=
12
+
()
19
-
13
=
2
+
()
18
+
0
=
0
+
()
18
-
11
=
16
-
()
19
-
9
=
4
+
()
18
-
8
=
14
-
()
21
-
16
=
5
+
()
13
+
4
=
17
+
()
20
-
9
=
7
+
()
11
+
1
=
17
-
()
16
-
10
=
19
-
()
20
-
12
=
21
-
()
17
-
9
=
17
-
()
16
-
5
=
13
-
()
13
+
6
=
0
+
()
17
-
6
=
0
+
()
19
+
0
=
7
+
()
10
+
8
=
13
+
()
15
-
5
=
21
-
()
5
+
5
=
0
+
()
7
+
3
=
18
-
()
20
-
11
=
13
-
()
13
+
6
=
19
+
()
21
-
20
=
4
-
()
16
+
2
=
4
+
()
15
-
5
=
8
+
()
17
-
11
=
6
+
()
8
+
1
=
12
-
()
21
-
16
=
13
-
()
11
-
10
=
17
-
()
19
-
18
=
11
-
()
11
+
8
=
1
+
()
16
-
9
=
1
+
()
13
-
11
=
20
-
()
16
+
3
=
3
+
()
8
+
7
=
11
+
()
18
-
3
=
13
+
()
6
+
4
=
6
+
()
6
+
2
=
14
-
()
16
+
0
=
15
+
()
14
-
9
=
5
+
()
14
-
11
=
1
+
()
19
-
4
=
6
+
()
10
+
4
=
17
-
()
12
+
3
=
2
+
()
11
+
2
=
19
-
()
7
+
2
=
7
+
()
18
-
17
=
7
-
()
14
+
2
=
13
+
()
12
+
1
=
9
+
()
19
-
6
=
5
+
()
17
+
0
=
8
+
()
5
+
2
=
19
-
()
5
+
1
=
4
+
()
17
-
3
=
2
+
()
13
-
9
=
18
-
()
14
-
11
=
6
-
()
20
-
11
=
11
-
()
20
-
10
=
4
+
()
17
-
13
=
9
-
()
20
-
3
=
12
+
()
16
-
9
=
5
+
()
13
+
2
=
19
-
()
5
+
4
=
1
+
()
7
+
5
=
18
-
()
15
-
15
=
2
-
()
16
-
4
=
6
+
()
14
-
11
=
2
+
()
20
-
20
=
10
-
()
12
+
6
=
12
+
()
17
-
9
=
7
+
()
3
+
1
=
12
-
()
12
+
4
=
0
+
()
5
+
1
=
19
-
()
17
-
9
=
5
+
()
12
-
11
=
8
-
()
3
+
2
=
14
-
()
11
+
5
=
4
+
()
20
-
15
=
9
-
()
9
+
6
=
4
+
()
9
+
1
=
19
-
()
12
+
3
=
5
+
()
2
+
0
=
14
-
()
17
-
7
=
4
+
()
8
+
5
=
14
-
()
11
+
8
=
7
+
()
6
+
0
=
9
-
()
17
-
11
=
18
-
()
19
-
13
=
10
-
()
15
+
1
=
18
-
()
20
-
9
=
12
-
()
20
-
9
=
9
+
()
17
-
15
=
14
-
()
7
+
1
=
9
-
()
2
+
1
=
17
-
()
20
-
8
=
10
+
()
17
-
13
=
9
-
()
20
-
2
=
12
+
()
20
-
19
=
8
-
()
17
-
5
=
5
+
()
17
-
12
=
7
-
()
17
-
16
=
20
-
()
19
-
8
=
20
-
()
19
-
18
=
19
-
()
16
+
2
=
5
+
()
7
+
2
=
18
-
()
7
+
5
=
1
+
()
16
-
11
=
2
+
()
10
+
1
=
6
+
()
14
+
5
=
7
+
()
15
-
7
=
14
-
()
16
-
8
=
19
-
()
18
-
3
=
18
-
()
18
-
12
=
7
-
()
9
+
5
=
19
-
()
15
+
4
=
9
+
()
19
-
14
=
13
-
()
5
+
4
=
16
-
()
13
+
3
=
18
-
()
18
-
14
=
21
-
()
16
-
10
=
4
+
()
16
-
4
=
19
-
()
16
+
3
=
16
+
()
20
-
10
=
19
-
()
16
-
11
=
12
-
()
13
-
7
=
20
-
()
21
-
10
=
14
-
()
16
-
11
=
21
-
()
10
+
2
=
12
+
()
19
-
8
=
21
-
()
14
+
1
=
15
+
()
16
-
11
=
12
-
()
19
-
12
=
2
+
()
4
+
3
=
17
-
()
12
-
9
=
9
-
()
15
-
15
=
4
-
()
20
-
3
=
10
+
()
9
+
1
=
7
+
()
18
-
11
=
14
-
()
16
-
13
=
9
-
()
15
-
9
=
20
-
()
20
-
2
=
20
-
()
16
-
8
=
15
-
()
3
+
1
=
16
-
()
10
+
3
=
18
-
()
19
-
12
=
3
+
()
9
+
2
=
9
+
()
20
-
2
=
14
+
()
20
-
4
=
7
+
()
3
+
2
=
17
-
()
15
-
14
=
0
+
()
6
+
3
=
16
-
()
12
+
4
=
1
+
()
17
-
8
=
2
+
()
4
+
0
=
10
-
()
15
-
13
=
7
-
()
19
-
18
=
14
-
()
19
-
12
=
19
-
()
7
+
2
=
18
-
()
19
-
14
=
20
-
()
19
-
2
=
3
+
()
15
-
7
=
6
+
()
9
+
7
=
14
+
()
10
+
4
=
15
-
()
20
-
6
=
9
+
()
17
-
13
=
6
-
()
10
+
1
=
7
+
()
14
+
1
=
7
+
()
17
+
1
=
9
+
()
9
+
8
=
5
+
()
14
-
14
=
5
-
()
8
+
0
=
17
-
()
15
-
13
=
7
-
()
5
+
1
=
3
+
()
11
+
3
=
4
+
()
10
+
6
=
20
-
()
13
-
7
=
18
-
()
12
-
10
=
19
-
()
17
-
11
=
3
+
()
19
-
6
=
11
+
()
14
-
9
=
16
-
()
14
+
0
=
20
-
()
12
+
6
=
7
+
()
18
-
9
=
5
+
()
12
+
4
=
1
+
()
12
+
2
=
13
+
()
13
-
8
=
17
-
()
18
-
8
=
15
-
()
6
+
4
=
5
+
()
14
+
0
=
12
+
()
19
-
3
=
18
-
()
9
+
0
=
16
-
()
20
-
14
=
3
+
()
18
+
0
=
18
+
()
18
-
4
=
15
-
()
14
+
5
=
13
+
()
9
+
8
=
14
+
()
14
-
12
=
15
-
()
21
-
15
=
12
-
()
17
-
4
=
1
+
()
18
-
13
=
10
-
()
13
+
0
=
9
+
()
17
-
13
=
15
-
()
8
+
0
=
2
+
()
16
-
6
=
20
-
()
18
-
3
=
11
+
()
13
+
5
=
19
-
()
17
-
5
=
9
+
()
17
-
13
=
2
+
()
20
-
2
=
21
-
()
14
-
14
=
9
-
()
19
-
15
=
15
-
()
14
-
6
=
7
+
()
20
-
5
=
17
-
()
20
-
3
=
11
+
()
18
+
1
=
19
+
()
4
+
2
=
20
-
()
11
+
8
=
20
-
()
19
-
6
=
11
+
()
4
+
4
=
5
+
()
10
+
5
=
18
-
()
9
+
6
=
4
+
()
14
+
3
=
12
+
()
19
-
12
=
16
-
()
11
+
2
=
9
+
()
19
-
16
=
19
-
()
19
-
14
=
3
+
()
10
+
9
=
1
+
()
16
-
14
=
1
+
()
13
+
4
=
14
+
()
13
-
7
=
18
-
()
21
-
8
=
20
-
()
4
+
4
=
6
+
()
15
-
11
=
20
-
()
20
-
5
=
19
-
()
14
-
7
=
1
+
()
19
-
8
=
10
+
()
18
-
17
=
11
-
()
9
+
3
=
18
-
()
15
-
10
=
5
+
()
14
-
9
=
19
-
()
14
+
1
=
15
+
()
18
-
9
=
3
+
()
15
-
6
=
6
+
()
6
+
2
=
15
-
()
14
-
8
=
0
+
()
12
+
5
=
14
+
()
7
+
6
=
0
+
()
20
-
15
=
7
-
()
18
-
13
=
17
-
()
18
-
13
=
11
-
()
9
+
5
=
17
-
()
18
-
8
=
19
-
()
19
-
1
=
2
+
()
15
-
6
=
8
+
()
17
-
6
=
2
+
()
18
-
15
=
13
-
()
18
-
6
=
10
+
()
20
-
4
=
12
+
()
21
-
16
=
15
-
()
18
-
9
=
14
-
()
15
-
15
=
13
-
()
18
-
3
=
14
+
()
11
+
3
=
6
+
()
6
+
4
=
18
-
()
10
+
3
=
19
-
()
15
-
5
=
1
+
()
14
-
9
=
10
-
()
13
-
7
=
13
-
()
13
+
1
=
12
+
()
15
-
6
=
13
-
()
14
-
13
=
11
-
()
11
+
2
=
15
-
()
12
-
11
=
10
-
()
18
-
4
=
2
+
()
17
-
3
=
20
-
()
13
+
4
=
3
+
()
21
-
5
=
7
+
()
20
-
1
=
5
+
()
3
+
1
=
9
-
()
11
+
4
=
1
+
()
15
-
13
=
16
-
()
14
+
2
=
16
+
()
14
+
5
=
18
+
()
18
-
9
=
6
+
()
14
-
9
=
14
-
()
16
+
1
=
15
+
()
19
-
6
=
18
-
()
12
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