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15
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1-2
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1
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x
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y
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x
0
1
2
3
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1
3
5
7
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y
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x
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a
x
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1
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a
x
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y
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1.5,4
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(
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y
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2
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x
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y
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10
70
y
x
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70
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80
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80
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10
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70
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1
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A
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2
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r
r
B
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1
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r
r
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D
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