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y'''' + 2y'' + y = 0; y(0) = 0; y'(0) = 0; y''(0) = 0; y'''(0) = 1
y'''' + 2y'' + y = 0; y(0) = 0; y'(0) = 0; y''(0) = 0; y'''(0) = 1
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