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/ //---`'   \ ` //   |    \\    -| ||-  |  --  // 
\ \\___      | ||    | [] ||    _| ||_  |  --  \\ 
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  `----`     `-`'    |_|`-`    `-----`  `------`  
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發送短信 : Nonlinear Superlinear Singular and Nonsingular Second Order Boundary Value Problems