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 /  ___||   / _ \\    ____      / _ \\  | |  | || 
| // __    / //\ \\  |    \\   / //\ \\ | |/\| || 
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  `---`   `-`   `-`  |_|`-`   `-`   `-` `-`   `-` 
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Text this: Computation of the flows over flapping airfoil by the euler equations