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| || | || | || | || |  __ \\   \ \\/ //   / ___// 
| || | || | || | || | |  \ ||   \ ` //    \___ \\ 
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  `---`     `---`    -----`      `-`'   `-----`

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Text this: Geometric criterion for RR↔MR transition in hypersonic double-wedge flows