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We consider shear flow solutions of Prandtl type : $$ u^\\nu(t,x,y) \\, = \\, \\big (U^E(t,y) + U^{BL}(t,\\frac{y}{\\sqrt{\\nu}})\\,, \\, 0 \\big )\\, , \\quad 0<\\nu \\ll 1\\,. $$ We show that if $U^{BL}$ is monotonic and concave in $Y = y /\\sqrt{\\nu}$ then $u^\\nu$ is stable over some time interval $(0,T)$, $T$ independent of $\\nu$, under perturbations with Gevrey regularity in $x$ and Sobolev regularity in $y$. 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We consider shear flow solutions of Prandtl type : $$ u^\\nu(t,x,y) \\, = \\, \\big (U^E(t,y) + U^{BL}(t,\\frac{y}{\\sqrt{\\nu}})\\,, \\, 0 \\big )\\, , \\quad 0<\\nu \\ll 1\\,. $$ We show that if $U^{BL}$ is monotonic and concave in $Y = y /\\sqrt{\\nu}$ then $u^\\nu$ is stable over some time interval $(0,T)$, $T$ independent of $\\nu$, under perturbations with Gevrey regularity in $x$ and Sobolev regularity in $y$. 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