\[\begin {array} {1 1} (1)\;y'''+3y''+3y'+y=0 & \quad (2)\;y'''+3y''-3y'-y=0 \\ (3)\;y'''+3y''-3y'+y=0 & \quad (4)\;y'''-3y''+3y'-y=0 \end {array}\]

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