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We have to modulo a central character for ${sl_2}$ to obtain irreducible degenerate Whittaker $\\widehat{sl_2} $-modules with noncritical level. In the case of critical level the universal Whittaker module is reducible. 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We have to modulo a central character for ${sl_2}$ to obtain irreducible degenerate Whittaker $\\widehat{sl_2} $-modules with noncritical level. In the case of critical level the universal Whittaker module is reducible. 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