If m and n are order and degree of the equation ${\left(\frac{d^{2}y}{d{x}^2}\right)}^5+4\frac{{\left(\frac{d^{2}y}{d{x}^2}\right)}^3}{\frac{d^{3}y}{d{x}^3}}+\frac{d^{3}y}{d{x}^3}=x^2-1$
  then  $\frac{m}{n}$ is 

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