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        Top Line 1
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    | Top Arc? | 
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        Top Line 2
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    | Top Arc? | 
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        Top Line 3
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    | Top Arc? | 
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        Top Line 4
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    | Top Arc? | 
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        Top Line 5
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    | Top Arc? | 
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        Top Line 6
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    | Top Arc? | 
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        Bottom Line 1
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    | Top Arc? | 
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        Bottom Line 2
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    | Top Arc? | 
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        Bottom Line 3
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    | Top Arc? | 
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        Bottom Line 4
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    | Top Arc? | 
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        Bottom Line 5
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    | Top Arc? | 
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        Bottom Line 6
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    | Top Arc? |