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Created with Raphaël 2.1.4
13, 4
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4
x
23
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21, 22
/
18
/
4
x
19, 20
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/
4
+
18
/
+
17
/
4
x
16
/
15
1
+
14
/
1
13, 4
/
6
/
+
12
/
4
x
10, 11
1
/
+
9
/
1
6
/
4
x
7, 8
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/
1
+
6
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+
5
/
1
4
x
2, 3
1
/
1
1
+
0
1